Slipstream Windows 7/SP1 ISO W/ All Updates

I have taken to installing Windows 10 via a Fresh Install of Win7 as a precursor to installing Win10

The biggest problem has been doing an FnR (Format & Reinstall) of Windows 7 as a precursor to installing Windows 10...

Oh my gods, the Windows 7 UPDATE Server takes FOREVER!!

So, what I want to do is take my standard AIO Windows 7/SP1 ISO and add only the updates necessary to facilitate a Windows 10 install. I am hoping this will also facilitate the Win10 install. I had a customer's computer that I was upgrading for them and it sat on the Windows 10 Install screen for 6 hours.. I kid you not!!

I think it took so long because it had to update the Win7 Install first... Did I mention that the Win7 Update Server takes forever!??

Anywho, I was hoping someone could help me out with the SlipStream.. All the docs and guides and tuts I have read start with a virgin Win7 disk and explains how to do the SP1 etc etc and it hopelessly confuses
me... I just want to start from the Win7/SP1 AIO and add the updates..

Any assistance would be appreciated...

I don't think you need a completely updated Windows 7 to do the 10 upgrade -

As a test, I installed Windows 7 SP1 in a VM (and activated it), when I clicked updates in control panel it first downloads some kinda file necessary for updates, then I stopped it there and didn't bother with the 200 1GB of updates. I double checked it was activated, and upgraded to Windows 10 using the media creation tool from here

https://www.microsoft.com/en-us/soft...load/windows10

The upgrade went OK and was activated. At this point, once your hardware is registered at Microsoft, you can do a clean install of 10 using the iso downloaded previously and it will activate because MS recognize your mobo etc. I did this as an experiment to see if It was possible to do a 7 >> 10 install without all the updates, and it seems you can (must have SP1 and be activated - in 'grace period' doesn't work - tested that also. AFAIK updates must be set to auto).

I did this in a VM so YMMV, but you'll prob be OK.

I do know (or am pretty sure AAR) that you have to have IEX 11 to update to Win10...

Other that, your advice sounds good.. I'll give it a try..

Thanx