Solved How to check that I have a Windows 10 license in Windows 7.

dietlbomb

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Earlier this evening I upgraded to Windows 10 and immediately downgraded back to Windows 7 in order to secure a license for Windows 10 for whenever (if ever) Microsoft improves Windows 10 enough to make it worth using. Is there a way to check that I have secured the Windows 10 license from the Windows 7 environment?
 

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I'm not exactly sure how you'd do that, but I'd be interested in knowing myself.

I assume you did an "upgrade install" through Windows Update, rather than any type of install from a DVD or USB stick?

Did you confirm that Windows 10 was in fact activated?

Obviously, you could do a clean install of 10 and see if it that was permitted and activated. But you'd take the risk of wiping out a good Win 7 install and not have a valid 10 install and then might be stuck in no-man's land.

I have Win 7 right now. Earlier today, I made a USB stick installer for Windows 10 using a legit ISO downloaded from Microsoft directly.

I booted from that installer stick and went 5 or 6 mouse-clicks into the installation program to confirm that the stick worked and would likely succeed in making a clean install if I choose to do that before the free upgrade expires in late July. Everything seemed to be kosher. I went as far as the window where you are asked if you want to do a custom install or an upgrade install. I chose "custom install" and was then presented with a list of partitions to which I could install if I wanted to. That's where I cancelled out and I think it's a pretty good confirmation that the stick would work.

You went farther than I did and actually did the 10 install. I didn't have the nerve to do it because I did not have complete faith in the rollback to 7 process, nor do I have complete faith in image restoration.
 

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Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.

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Win 10 Pro x64Intel I5-2500K @3.3GHz16GB G.Skill Ripjaws X (4x4GB)EVGA GeForce 750 Ti SC 2GB
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PC/Desktop
Computer Manufacturer/Model Number
Self Built
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Win 10 Pro x64
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Intel I5-2500K @3.3GHz
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Asrock P67 Extreme4
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16GB G.Skill Ripjaws X (4x4GB)
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EVGA GeForce 750 Ti SC 2GB
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ASUS Xonar DG 5.1 Channels 24-bit 96KHz PCI Interface Sound
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auria eq2367
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1920 x 1080
Hard Drives
250GB Samsung 850 EVO SSD
1TB WD Blue
1TB Hitachi
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SeaSonic X 650W 80 Plus Gold
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Corsair Obsidian 750D
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Corsair H60, Three 140mm case fans
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Logitech Wireless Keyboard K520
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Logitech Wireless Mouse M310
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Wave Broadband ~ 100 dn 5 up
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Windows Defender, Malwarebytes Premium
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Edge, IE11, Chrome
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Laptop specs: HP g7-1365dx /
CPU: AMD A6-3420M APU with Radeon(tm) HD Graphics /
RAM: Crucial 8Gb (2x4Gb) /
SSD: Crucial M4-CT128M4SSD2 ATA Device/ FW 000F /
GFX: AMD Radeon HD 6520G /
OS: Windows 10 Pro x64
I'm not exactly sure how you'd do that, but I'd be interested in knowing myself.

I assume you did an "upgrade install" through Windows Update, rather than any type of install from a DVD or USB stick?

Did you confirm that Windows 10 was in fact activated?

Obviously, you could do a clean install of 10 and see if it that was permitted and activated. But you'd take the risk of wiping out a good Win 7 install and not have a valid 10 install and then might be stuck in no-man's land.

I have Win 7 right now. Earlier today, I made a USB stick installer for Windows 10 using a legit ISO downloaded from Microsoft directly.

I booted from that installer stick and went 5 or 6 mouse-clicks into the installation program to confirm that the stick worked and would likely succeed in making a clean install if I choose to do that before the free upgrade expires in late July. Everything seemed to be kosher. I went as far as the window where you are asked if you want to do a custom install or an upgrade install. I chose "custom install" and was then presented with a list of partitions to which I could install if I wanted to. That's where I cancelled out and I think it's a pretty good confirmation that the stick would work.

You went farther than I did and actually did the 10 install. I didn't have the nerve to do it because I did not have complete faith in the rollback to 7 process, nor do I have complete faith in image restoration.

If you have a spare HD or SSD you could disconnect your current drives and do a clean install of Win 10 to that (clean) drive.
Then you don't have to worry about anything on your current drives being changed, and you would not need to use a rollback or restore to get back to Win 7, just disconnect the W10 drive and re-connect the W7 drive.
That would activate Win 10 for your PC so you could play with W10 and see if you want it now, later, or never.
 

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Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x6...AMD Athlon II x4 6206GB GSkill DDR2 800AMD 4670 GPU + AMD 4200 IGP
Computer type
PC/Desktop
Computer Manufacturer/Model Number
home built
OS
Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
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AMD Athlon II x4 620
Motherboard
Gigabyte GA-MA785G-UD3H
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6GB GSkill DDR2 800
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AMD 4670 GPU + AMD 4200 IGP
Sound Card
on board Realtek ALC889A
Monitor(s) Displays
RCA 40" LCD TV, Insignia 32" LCD TV, HP 15" LCD monitor
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1680 x 1050
Hard Drives
OCZ Vertex 3 120GB,
Samsung F3 1TB (3),
Several others - WD, Seagate, Hitachi, ...
PSU
Corsair 500 W
Case
Rosewill mid tower
Cooling
CM 90mm rifle
Keyboard
Gyration wireless, Logitech wireless, Dell USB wired
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Gyration wireless, Logitech wireless, V7 USB wired
Internet Speed
Spectrum - 100Mbps D / 10Mbps U
Antivirus
Avast, MBAM3, EMET, WinPatrol
Browser
Pale Moon, Firefox, IE
Other Info
2 multi-boot PC's
Mainly HTPC/Office/Gen purpose (no gaming).
Trendnet USB KVM.
LG DVD burner/Blue Ray Player.
Tray system for removable SATA backup drives.

Not currently OCd, under-volted.
I use Hybrid sleep, rarely re-boot or shutdown.

Hauppauge HD-PVR, Avermedia PCIe TV Tuner, Hauppauge PCI TV Tuner.
David or Derek:

David: I think you answered my following questions, but I want explicit confirmation.

Can either of you guys comment or confirm what I have in mind per the following:

I have a recent highly configured retail and activated Win 7 SP1 install.

I want to try Win 10 for a few weeks or months or possibly forever, but I want a totally reliable fall back position to Win 7. I don't want to trust imaging or Win 7 rollback.

Is this legit per the EULA and problem-free:

Remove existing SSD containing 7.

Install new empty SSD.

Clean install 10 to the new SSD from USB stick made from legit downloaded ISO, activating with my Win 7 retail key.

Confirm 10 is activated.

Use it for a month or two or three and keep it if I like it.

If I don’t, remove the new SSD and replace it with the old SSD containing my current activated Win 7.

Put the new SSD with the Win 10 installation into the closet. Possibly bring it out months or years later if I decide to again try Win 10.

This is one PC, one retail license, and not a dual boot. No reliance on imaging or Windows rollback—just an SSD swap. Each SSD contains an activated Windows installation—one for 7 and one for 10.

I might be able to do something like this with a dock, but I don’t want to get involved with that.

I don’t anticipate constantly switching back and forth from one SSD to the other. I just want a foolproof fallback position if I don’t like Win 10.

Four questions:

1: is this allowed per the EULA and MS regulations?
2: if not, exactly why not?
3: do you know of anyone who has actually done this or something very similar (not a dual boot)?
4: what are the pitfalls or possible problems with this, considering I might change hardware at any moment?

Thanks for any confirmation on this, especially if you've done it or can point me to a discussion of the topic. I googled it a bit a couple of days ago and couldn't find anyone who'd done exactly what I have in mind.
 

My Computer My Computer

At a glance

Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
When you perform an upgrade, either via an in place upgrade or a fresh install using the original key, the original licence becomes invalid, replaced by the new digital entitlement Licence .

If you upgrade and then use the roll-back option within the 30 day period allowed the original licence will be re-instated and the digital will also be retained on Microsoft's servers, this is the only allowable way to legally revert that I am aware of. If the roll-back fails you can contact Microsoft who should sort things out as usual. this would also apply with the digital version of a retail licence if major changes are made to hardware in future, although actual details are scarce due to the "New" status of the actual Digital entitlement process
 

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    Windows 11 Pro x64 [Latest Release and Releas...Ryzen 9 5950X, 3.8 - 5.2 MHz64GB [2 x 32GB] DDR4 3200MHz4GB NVIDIA GEFORCE GTX 1650 Ti
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    ChillBlast - Custom to my design
    OS
    Windows 11 Pro x64 [Latest Release and Release Preview]
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    Ryzen 9 5950X, 3.8 - 5.2 MHz
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    Asus Prime X570-Pro
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    64GB [2 x 32GB] DDR4 3200MHz
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    NZXT C750 80 PLUS Gold 750W Modular PSU
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    Workstation Case [Matt Black]
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    NZXT Kraken X63 280mm CPU Cooler +2x Quiet Case fans
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    Logitech Wireless MX Keys & K400 + others
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    Logitech Wireless MX Master 3S
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    920 MB Down 50 MB Up
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    BitDefender Total Security Pro
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    Chrome (always run latest Non-Beta)
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    Dell XPS 17 10750H
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    Windows 11 Pro x64 Latest RP
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    Intel I7 10750H 5.0GHz
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    Wacom Intuos Pro Small Pen Pad
    Wacom Expresskeys Remote
    Loopdeck+ Graphics Controller
    Shuttle Pro v2 Control Pad
    10TB NAS
If you upgrade and then use the roll-back option within the 30 day period allowed the original licence will be re-instated and the digital will also be retained on Microsoft's servers, this is the only allowable way to legally revert that I am aware of. process

Barman:

Are you implying or stating outright that a restoration of an activated legit Win 7 image (not a roll-back from within 10 itself within 30 days) is not legit or would fail in some way, whether done inside or outside of the 30 day window?

I would have thought that tens of thousands of people have tried it by now, so I wouldn't think there would be any gray area after nearly a year since the official release of Win 10.
 

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Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
As I stated this is the only method I personally know that works, It may well be that the actual transfer of the licence take place after the 30 days rather than immediately and so would allow other re-install methods to work. As I have not read any definitive statement from Microsoft, (plenty of contradictory rumours, of course ), I can only state my experience

However, It has always been the case that although the retail licence may be transferred It can only be present on one system at any one time. Your plan would have the licence present on two hard disks at the same time although of course not actually in use, (I don't know how to consider backup images which have a valid licence and so would also technically break the EULA ;) )

How this is going to work with the new digital system is not really known yet but it should be more secure than the old system as all licences would be held in one place.
 

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    Windows 11 Pro x64 [Latest Release and Releas...Ryzen 9 5950X, 3.8 - 5.2 MHz64GB [2 x 32GB] DDR4 3200MHz4GB NVIDIA GEFORCE GTX 1650 Ti
    Computer type
    PC/Desktop
    Computer Manufacturer/Model Number
    ChillBlast - Custom to my design
    OS
    Windows 11 Pro x64 [Latest Release and Release Preview]
    CPU
    Ryzen 9 5950X, 3.8 - 5.2 MHz
    Motherboard
    Asus Prime X570-Pro
    Memory
    64GB [2 x 32GB] DDR4 3200MHz
    Graphics Card(s)
    4GB NVIDIA GEFORCE GTX 1650 Ti
    Sound Card
    On-board SPDIF to 5.1 System + HDMI [5.1 system]
    Monitor(s) Displays
    32" UHD 32 Bit HDR Monitor + 43" UHD 4K 32Bit HDR TV
    Screen Resolution
    2 x 3840 x 2160 @60Hz
    Hard Drives
    1TB M2 SSD OS, 500GB Fast Access SSD, 2 x 8TB Data + Various Externals from 1TB to 4TB, 10TB NAS
    PSU
    NZXT C750 80 PLUS Gold 750W Modular PSU
    Case
    Workstation Case [Matt Black]
    Cooling
    NZXT Kraken X63 280mm CPU Cooler +2x Quiet Case fans
    Keyboard
    Logitech Wireless MX Keys & K400 + others
    Mouse
    Logitech Wireless MX Master 3S
    Internet Speed
    920 MB Down 50 MB Up
    Antivirus
    BitDefender Total Security Pro
    Browser
    Chrome (always run latest Non-Beta)
    Other Info
    Also run ...
    Laptop - Quad 8GB - Windows 10 Pro x64
    Nexus 7 Android tablet x2
    Samsung 10.2" tablet
    Blackview TAB 8 4G Android Tablet c/w Keyboard
    Wacom Intuos Pro Medium Pen Pad
    Wacom Intuos Pro Small Pen Pad
    Wacom Expresskeys Remote
    Loopdeck+ Graphics Controller
    Shuttle Pro v2 Control
  • At a glance

    Windows 11 Pro x64 Latest RPIntel I7 10750H 5.0GHz32GB [2x16GB] DDR4 2933 MHznVidia GTX1650Ti 4 GB GDDR6
    Computer type
    Laptop
    System Manufacturer/Model Number
    Dell XPS 17 10750H
    OS
    Windows 11 Pro x64 Latest RP
    CPU
    Intel I7 10750H 5.0GHz
    Motherboard
    Dell XPS
    Memory
    32GB [2x16GB] DDR4 2933 MHz
    Graphics Card(s)
    nVidia GTX1650Ti 4 GB GDDR6
    Sound Card
    Stock [Realtek] 4 Speaker
    Monitor(s) Displays
    17" IPS UHD+ Infinity Edge Touchscreen
    Screen Resolution
    3840 x 2400
    Hard Drives
    2TB M2 NVMe, 4TB External + various 500GB & 1TB External NVMe (also have access to spinner HDD from
    PSU
    Stock
    Case
    Stock XPS Aluminium & Carbon Fibre
    Cooling
    Stock - Active Fan Control
    Keyboard
    Backlit + Various Logitech
    Mouse
    Stock Track Pad + Logitech MX Trackball
    Internet Speed
    72 MB Down 18MB Up
    Browser
    Chrome
    Other Info
    Also run ...
    Laptop - Quad 8GB - Windows 10 Pro x64
    Nexus 7 Android tablet x2
    10.2" tablet
    Sony Z3 Android Smartphone
    Wacom Intuos Pro Medium Pen Pad
    Wacom Intuos Pro Small Pen Pad
    Wacom Expresskeys Remote
    Loopdeck+ Graphics Controller
    Shuttle Pro v2 Control Pad
    10TB NAS
Can I take your response in post 8 to be a "no, not that I know of from personal experience and to the best of my knowledge" answer to the question I posed in post 7?

I'm not sure what you mean by "I don't know how you would consider backup images which also technically break the EULA" followed by a winking emoticon.

I was and am totally unaware that backup images violated a EULA, but maybe the winking emoticon means you are kidding or ?

I remain confused.
 

My Computer My Computer

At a glance

Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
If you just want to test drive Win 10 you can legally use the Enterprise Evaluation version.
This would give you a 90 day temporary license.
You could disconnect your current drives, connect a new drive and install the Enterprise Evaluation version.
Then there are no changes to your Win 7 license/install, it isn't used for the Enterprise Evaluation version.
You do need a MS account to download the Enterprise Evaluation version.
https://www.microsoft.com/en-us/evalcenter/evaluate-windows-10-enterprise

I used the Enterprise Evaluation version for Win 8.1 and it worked fine for me, no problems, it served my purpose to see if i wanted 8.1.
I do get a few emails from MS about the EE version, no biggie to me.

I've never read that using and restoring backup images violates EULA !!!
I've used them for many years without any issues.
Some people may have problems restoring an image, but i don't know of any one that lost a valid license.
Worst case i know of is, some folks have to phone re-activate a license, depending on what they did.

In post #5 you stated "considering I might change hardware at any moment".
If you change the motherboard, all bets are off, that change could be considered a new PC and have licensing issues.
 

My Computer My Computer

At a glance

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x6...AMD Athlon II x4 6206GB GSkill DDR2 800AMD 4670 GPU + AMD 4200 IGP
Computer type
PC/Desktop
Computer Manufacturer/Model Number
home built
OS
Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
CPU
AMD Athlon II x4 620
Motherboard
Gigabyte GA-MA785G-UD3H
Memory
6GB GSkill DDR2 800
Graphics Card(s)
AMD 4670 GPU + AMD 4200 IGP
Sound Card
on board Realtek ALC889A
Monitor(s) Displays
RCA 40" LCD TV, Insignia 32" LCD TV, HP 15" LCD monitor
Screen Resolution
1680 x 1050
Hard Drives
OCZ Vertex 3 120GB,
Samsung F3 1TB (3),
Several others - WD, Seagate, Hitachi, ...
PSU
Corsair 500 W
Case
Rosewill mid tower
Cooling
CM 90mm rifle
Keyboard
Gyration wireless, Logitech wireless, Dell USB wired
Mouse
Gyration wireless, Logitech wireless, V7 USB wired
Internet Speed
Spectrum - 100Mbps D / 10Mbps U
Antivirus
Avast, MBAM3, EMET, WinPatrol
Browser
Pale Moon, Firefox, IE
Other Info
2 multi-boot PC's
Mainly HTPC/Office/Gen purpose (no gaming).
Trendnet USB KVM.
LG DVD burner/Blue Ray Player.
Tray system for removable SATA backup drives.

Not currently OCd, under-volted.
I use Hybrid sleep, rarely re-boot or shutdown.

Hauppauge HD-PVR, Avermedia PCIe TV Tuner, Hauppauge PCI TV Tuner.
Thanks for the replies everyone.

I'm not exactly sure how you'd do that, but I'd be interested in knowing myself.

I assume you did an "upgrade install" through Windows Update, rather than any type of install from a DVD or USB stick?

I did do the upgrade install through Windows Update. It took about an hour to complete and the rollback took about 10 minutes.

Did you confirm that Windows 10 was in fact activated?

Did you confirm that Windows 10 was in fact activated?

Just adding to this question above,

Activation of Windows 10 - Check - Windows 10 Forums

I did not. I had assumed that by completing the update that the license transfer would be automatic, but I later learned that it happens asynchronously at some point after the update. So I don't know whether it was activated or not.

I think I need to run through the whole process again.
 

My Computer My Computer

At a glance

Windows 7 Professional 64bitIntel Core i5-3570K Ivy Bridge 3.4 GHz8.00 GBNvidia GeForce GTX 660 2GB
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Professional 64bit
CPU
Intel Core i5-3570K Ivy Bridge 3.4 GHz
Motherboard
Gigabyte GA-Z77-DS3H
Memory
8.00 GB
Graphics Card(s)
Nvidia GeForce GTX 660 2GB
Hard Drives
Kingston HyperX 3K 120GB SATA SSD
Seagate Barracuda ST1000DM003 1TB HDD
Browser
Pale Moon
If you used the built in rollback MAYBE the Win 10 license info is in Win 7 somewhere, such as the Windows.old folder.
If you installed Win 10 with a MS account (not Local), the license info MIGHT be available in your MS Onedrive data.
I don't know, maybe someone on the sister site Ten Forums could help answer.
Windows 10 Forums
 

My Computer My Computer

At a glance

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x6...AMD Athlon II x4 6206GB GSkill DDR2 800AMD 4670 GPU + AMD 4200 IGP
Computer type
PC/Desktop
Computer Manufacturer/Model Number
home built
OS
Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
CPU
AMD Athlon II x4 620
Motherboard
Gigabyte GA-MA785G-UD3H
Memory
6GB GSkill DDR2 800
Graphics Card(s)
AMD 4670 GPU + AMD 4200 IGP
Sound Card
on board Realtek ALC889A
Monitor(s) Displays
RCA 40" LCD TV, Insignia 32" LCD TV, HP 15" LCD monitor
Screen Resolution
1680 x 1050
Hard Drives
OCZ Vertex 3 120GB,
Samsung F3 1TB (3),
Several others - WD, Seagate, Hitachi, ...
PSU
Corsair 500 W
Case
Rosewill mid tower
Cooling
CM 90mm rifle
Keyboard
Gyration wireless, Logitech wireless, Dell USB wired
Mouse
Gyration wireless, Logitech wireless, V7 USB wired
Internet Speed
Spectrum - 100Mbps D / 10Mbps U
Antivirus
Avast, MBAM3, EMET, WinPatrol
Browser
Pale Moon, Firefox, IE
Other Info
2 multi-boot PC's
Mainly HTPC/Office/Gen purpose (no gaming).
Trendnet USB KVM.
LG DVD burner/Blue Ray Player.
Tray system for removable SATA backup drives.

Not currently OCd, under-volted.
I use Hybrid sleep, rarely re-boot or shutdown.

Hauppauge HD-PVR, Avermedia PCIe TV Tuner, Hauppauge PCI TV Tuner.
In post #5 you stated "considering I might change hardware at any moment".
If you change the motherboard, all bets are off, that change could be considered a new PC and have licensing issues.

When the underlying license is RETAIL???!!!!!

I assume you changed your mind about my needing an Enterprise version between your post 4 and your post 10 for some reason??
 

My Computer My Computer

At a glance

Windows 7 Home Premium SP1, 64-bitIntel Skylake i5-6600K, not overclocked8 GB HyperX DDR4-2666 (2 x 4 GB)none; graphics are integrated on CPU
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Ignatz Special; 4 speed manual gearbox; factory air conditioning; one of one
OS
Windows 7 Home Premium SP1, 64-bit
CPU
Intel Skylake i5-6600K, not overclocked
Motherboard
AsRock Z170M Extreme 4, micro ATX
Memory
8 GB HyperX DDR4-2666 (2 x 4 GB)
Graphics Card(s)
none; graphics are integrated on CPU
Sound Card
onboard: Realtek ALC1150; external: USB Behringer UF0-202
Monitor(s) Displays
Dell S2340M 23 inch IPS
Screen Resolution
1600 x 900
Hard Drives
System: Crucial MX100 series SSD, 128 GB;
Data: Samsung Spinpoint 103SJ, 1 TB;
Backup: WD Caviar Green WD30EZRX-00D8PB0, 3 TB
PSU
Rosewill SilentNight 500 watt fanless, semi-modular
Case
Antec Solo II
Cooling
Noctua NH-U12S; Noctua F12 intake, Noctua S12A exhaust
Keyboard
Microsoft 200 6JH-00001 USB
Mouse
Dell or Microsoft optical wired; USB
Antivirus
Microsoft Security Essentials and Malwarebytes Premium
Browser
Pale Moon
Other Info
All fans PWM; speeds at idle: CPU circa 500 rpm; intake circa 600 rpm; exhaust circa 600 rpm; CPU temps 27 idle and 47 C load in a warm room (27 C/81 F) when running Intel Extreme Tuning Utility stress test.
When the underlying license is RETAIL???!!!!!
MS has not been clear about this question as far as i know.

A Windows 10 license is good for the "life of the device", right ?
And a Windows Retail license is transferable to a new device (PC), right ?

So does that mean i can build a new PC any-time i want, and transfer my W10 (free upgrade) Retail license to a new PC for the rest of my life ?
I questioned this long ago, and i have never seen a definitive answer.
If anyone knows, i'd like to know.

Personally, i don't believe MS would allow a never ending W10 license, to a new PC, even if the prior Win license that was upgraded is Retail.
I hope i'm wrong, so i never have to pay for a Windows license again.

I assume you changed your mind about my needing an Enterprise version between your post 4 and your post 10 for some reason??
I didn't say you needed an Enterprise version.
I showed you can legally use the Enterprise Evaluation version to test W10.
MS does not have a Home User Evaluation version.
If you want to test drive W10 without affecting your W7/W8x license, it is possible.
 

My Computer My Computer

At a glance

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x6...AMD Athlon II x4 6206GB GSkill DDR2 800AMD 4670 GPU + AMD 4200 IGP
Computer type
PC/Desktop
Computer Manufacturer/Model Number
home built
OS
Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
CPU
AMD Athlon II x4 620
Motherboard
Gigabyte GA-MA785G-UD3H
Memory
6GB GSkill DDR2 800
Graphics Card(s)
AMD 4670 GPU + AMD 4200 IGP
Sound Card
on board Realtek ALC889A
Monitor(s) Displays
RCA 40" LCD TV, Insignia 32" LCD TV, HP 15" LCD monitor
Screen Resolution
1680 x 1050
Hard Drives
OCZ Vertex 3 120GB,
Samsung F3 1TB (3),
Several others - WD, Seagate, Hitachi, ...
PSU
Corsair 500 W
Case
Rosewill mid tower
Cooling
CM 90mm rifle
Keyboard
Gyration wireless, Logitech wireless, Dell USB wired
Mouse
Gyration wireless, Logitech wireless, V7 USB wired
Internet Speed
Spectrum - 100Mbps D / 10Mbps U
Antivirus
Avast, MBAM3, EMET, WinPatrol
Browser
Pale Moon, Firefox, IE
Other Info
2 multi-boot PC's
Mainly HTPC/Office/Gen purpose (no gaming).
Trendnet USB KVM.
LG DVD burner/Blue Ray Player.
Tray system for removable SATA backup drives.

Not currently OCd, under-volted.
I use Hybrid sleep, rarely re-boot or shutdown.

Hauppauge HD-PVR, Avermedia PCIe TV Tuner, Hauppauge PCI TV Tuner.
Thanks again all. I reinstalled Windows 10 today, this time checking that it was activated before I again uninstalled it. It took about 1/2 hour to download the files and 45 minutes to finish the install/uninstall cycle. I can't say whether this is a good idea for everyone, since most PCs don't behave the same, but for me the process went by without any problems.
 

My Computer My Computer

At a glance

Windows 7 Professional 64bitIntel Core i5-3570K Ivy Bridge 3.4 GHz8.00 GBNvidia GeForce GTX 660 2GB
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Professional 64bit
CPU
Intel Core i5-3570K Ivy Bridge 3.4 GHz
Motherboard
Gigabyte GA-Z77-DS3H
Memory
8.00 GB
Graphics Card(s)
Nvidia GeForce GTX 660 2GB
Hard Drives
Kingston HyperX 3K 120GB SATA SSD
Seagate Barracuda ST1000DM003 1TB HDD
Browser
Pale Moon
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