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Windows 7: Switching from Ultimate to Professional without reinstalling ?

08 Sep 2010   #1

Windows 7
 
 
Switching from Ultimate to Professional without reinstalling ?

I am using a Windows 7 Ultimate and I want to switch to Professional.
Is it possible to do this without having to reinstall windows again - ie format my C drive and then install Professional to it.
The obvious concern is that I would have to reinstall all software and that would be too much of a bother.

What is the best way to do this ?

And just fyi, I've also dual booted my machine with Fedora as well.

My System SpecsSystem Spec
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09 Sep 2010   #2

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, clean install, upgrade disc
 
 

To the best of my knowledge the only way to downgrade from Ultimate to Profesional is to reinstall.

A clean install would be the best way.
My System SpecsSystem Spec
09 Sep 2010   #3

Windows 7 Ultimate x64 SP1
 
 

There's no way to do that. You can only upgrade to higher editions. If you're at Ultimate, then if you want to go to a lower SKU, you will need to do a reinstall.
My System SpecsSystem Spec
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09 Sep 2010   #4
Microsoft MVP

 

You can change between retail versions with the popular workaround many beta testers used to change from the RC to a retail version.

Change the two registry keys shown below to Professional exactly as they are typed, which tricks the installer into thinking it is doing a Repair Install which is always allowed:

Switching from Ultimate to Professional without reinstalling ?-regkeys.png (click on image to enlarge)

Next run the Professional Installer from desktop, select "Keep Connected To Internet" to get latest drivers and updates into Installer, then "Upgrade". You will have to reactivate afterwards with the Professional Key, but activation is reset anyway in a Repair Install.

I tested this about two weeks ago successfully from Ult>Pro after reports it wasn't working. Another Guru also found it to work then.

The performance reported by many who tried it after Windows 7 release are the best reports ever on in-place Upgrade, completely contradicting MS claims that beta code couldn't be upgraded. Two friends of mine who I did the RC Upgrade to retail for via Remote Desktop don't even want the promised clean install now when I come to visit.


My System SpecsSystem Spec
09 Sep 2010   #5
Microsoft MVP

Windows 8.1 Pro with Media Center 64 bit
 
 

I've gone from Home Premium to Ultimate and then back to Home Premium "without re-installing" using the work around Gregrocker posted above.
My System SpecsSystem Spec
09 Sep 2010   #6

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, clean install, upgrade disc
 
 

Quote   Quote: Originally Posted by gregrocker View Post
You can change between retail versions using the popular workaround by which many beta testers changed from the RC to a retail version.

Change the two registry keys shown below to Professional exactly as they are typed, which tricks the installer into thinking it is doing a Repair Install which is always allowed:

Attachment 96355 (click on image to enlarge)

Next run the Professional Installer from desktop, select "Keep Connected To Internet" to get latest drivers and updates into Installer, then "Upgrade". You will have to reactivate afterwards with the Professional Key, but activation is reset anyway in a Repair Install.

I tested this about two weeks ago successfully from Ult>Pro after reports it wasn't working. Another Guru also found it to work then.

The performance reported by many who tried it after Windows 7 release are the best reports ever on in-place Upgrade, completely contradicting MS claims that beta code couldn't be upgraded. Two friends of mine who I did the RC Upgrade to retail for via Remote Desktop don't even want the promised clean install now when I come to visit.
Excellent, I would give rep for this, if I did not already. Great going Greg. You taught me too.
My System SpecsSystem Spec
14 Sep 2010   #7

Windows XP Service Pack 3
 
 

Can I also switch from Home Premium to Professional that way, or can I do it like an "upgrade"?
My System SpecsSystem Spec
14 Sep 2010   #8

Windows 7 Ultimate x64
 
 

Out of curiosity, what is the reason for wanting to downgrade?
My System SpecsSystem Spec
14 Sep 2010   #9
Microsoft MVP

Windows 8.1 Pro with Media Center 64 bit
 
 

Quote   Quote: Originally Posted by pparks1 View Post
Out of curiosity, what is the reason for wanting to downgrade?
In my case after doing an anytime upgrade to Ultimate (with an E-Bay key ). I had to go back to my legal Home Premium and didn't want to re-install. Anytime upgrade just unlocked the extra features so I used the workaround to disable them again. All my installed programs remained intact and I didn't have to reload all my music, pictures and documents. It saved me from having to redo everything from scratch.
My System SpecsSystem Spec
15 Sep 2010   #10
Microsoft MVP

Windows 8.1 Pro with Media Center 64 bit
 
 

Quote   Quote: Originally Posted by ishikawa01 View Post
Can I also switch from Home Premium to Professional that way, or can I do it like an "upgrade"?
There is really no need to do it if you are going up a version. Windows 7 is coded to let you go up in version with anytime upgrade. Just launch anytime upgrade and type in the product code for your Professional version. If its a valid code you will be upgraded to Pro and unlock the extra features of Pro. You may have to activate again but if its a legal code/version that shouldn't be a problem. Windows 7 just won't let you go back. It won't let you downgrade in versions unless you do the reg edit posted above and trick it into thinking you have a lower version.
My System SpecsSystem Spec
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 Switching from Ultimate to Professional without reinstalling ?





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