Posted June 03, 2016
Randalator: Uhm, a clean install with a Windows 7, 8 or 8.1 key has been possible ever since Windows 10 v1151 was released in November 2015. Create a boot medium with the Windows Media Creation Tool, do a clean install, activate with Windows key...easy as a really easy thing.
JAAHAS: I guess I better stay away from old parser-based adventure games then, as before my rant I had yet again failed to guess the correct combination of words to get any kind of results from Google about a way to skip the unnecessary upgrade over an old version... Another thing I never could find a clear answer is about the fate of the Windows 7/8x licenses after the upgrade. Some sources say that in order to not invalidate them one must use the go back option within one month from the upgrade, but others claim that with installation discs the old versions can still be reinstalled and activated at a later date. If so, are the old licenses now tied to the hardware ID like the Windows 10 license, or can we activate them elsewhere if we stop using Windows 10? I would like to retain at least a few Windows 7 licenses just in case I feel the need to run that OS on a VM.
Also, it depends on the kind of license you have, Retail licenses can be installed on as many computers as you wish (as long it's only one at a time), while Original Equipment Manufacturer licenses are tied to the motherboard.
(Also, when Microsoft did the "upgrade to Windows 8 Pro for 15€" promotion, it gave out Retail licenses, even if the Windows license you upgraded from was not Pro, neither Retail!)