Quote Originally Posted by DrNomis_44 View Post
As far as I understand, when you do the upgrade from Windows 7, or 8, to Windows 10, the serial that was linked to the computers running those versions of Windows, and stored on Microsoft's servers, is used to activate Windows 10 on those devices, I may be wrong though, but as long as Windows 7 and 8 were properly activated on those computers, you shouldn't have any problems, Microsoft offered Windows 10 as a free upgrade for Windows 7 and 8 when it was first released, I took advantage of the offer as soon as I could, haven't had very many problems with activations so far....touchwood.
Windows 10 upgrade free is still there and Google is your friend.

Some time back I lost the C drive and motherboard on my desktop PC ( PS went crazy ) and couldn't reinstall Win 10 so I reinstalled the Win 8.1 Pro and then did the upgrade again because of the way the licencing now works, MS were of little assistance almost to the point of being rude and unhelpful

Hence the reason for my interest