Re: Upgrade from Windows 7
I just updated my mother in law and next door neighbour from Win 7 Pro (OEM) to Windows 10 Pro, simply by doing a clean Win10 install and typing in the Win7 Pro product code. Worked like a charm.
I did hit a temporary snag though - one of the motherboards had a USB port failure, so I swapped it out for a replacement. Win10 said "hmm - this looks like a new computer" and de-activated itself, and nothing I could do would convince it to behave - other than "wait a few days". I left if off for four days (didn't have time to deal with it), and when I turned it back on ready to humbly call Microsoft customner serice, cap in hand, it magically reactivated by itself.