Both my desktop and laptop PCs were upgraded to Win10 from Win 7 Pro (full retail version). I then did a clean install from an ISO. They are now running Win 10 Pro with the Win10 generic licence key: VK7JG-NPHTM-C97JM-9MPGT-3V66T (they have very slightly different Product Ids). Both systems are fully activated.
If I were to change the licence key (Product Id?) to the relevant Windows 7 Pro licence key, does that mean I can then use that key on a replacement PC to activate an ISO built Win10?
In general, what are the benefits of so changing the licence key?
Happily running Windows 10 Pro on both desktop and laptop
We have more and more laws, and less and less enforcement