Hello, I have a Windows 8.1 system (64 bit) and I "qualified" for the Windows 10 free upgrade, which I could already do.
(My system is in French, sorry about that).)
What I'd like to do is to have both systems in the same computer, I know how to shrink my HD in order to have enough room for a system.
The problem is I don't know how to install W10, the official released version, in a partition while keeping my original system, Windows 8.1, in another partition of my HD. I want to be able to choose between systems when I boot my computer.