ALEXPREDATOR :
if you upgrade to windows 10 for free from windows 7, is it the same thing as buying windows 10?
What do you mean by "the same thing"?
If you have Windows 7, and buy Windows 10, you have 2 licenses, which could be used on 2 PC's.
If you have Windows 7, and Upgrade to Windows 10, you have 1 license for 1 PC.