Posted 04 August 2017 - 03:56 AM
Seeing as it seems to be a topic another note of what I can confirm so far from my business experiences:
You can still upgrade ANY windows 7 or 8 machine that currently has an activated (even non legit) copy of Windows to 10 if you use the original Windows 10 release ISO with internet disconnected. I have not seen a single scenario across hundreds of systems where it doesn't work. Once the Windows 10 installer updates get it online and let it activate and from then on you can just install whatever version of 10 you want (of course matching Pro or Home based on your upgrade) or just install the creators update from there. You will no have a Windows 10 OEM key for that hardware even if you revert back to 7 or 8. If you try this method with internet active it will usually tell you your key is invalid or that that upgrade has expired.
An easier method if you have your windows product key and Microsoft's activation servers don't hate you is to just put in you windows 7/8 key when you install 10 and it will validate based off that. It SHOULD work every time, but I have had some bad luck here and there with the 10 installer not recognizing the older key properly or other issues. Something like 20% of the time it's a pain.
As usual it's DRM and it can be a mess but it's far better than some of my past dealings with Windows activation.
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