I updated a few days after release by accident, I was just out of bed at 5 in the morning. The computer was still on and showed something my sleepy eyes did not register the next I know is i’m running Windows 10.
I downloaded and installed the newest eLincencer, before I even attempted to start Cubase. The only problem I encountered was, no sound from anything. There was a new driver from RME, so I installed that, and everything has been running really well since, I managed to work around the mmcss problem that Microsoft later fixed in a patch, that BTW affected all DAW’s.
And to be on topic, Rommelaar is right Win10 is free first year of release, and it’s the activation day that has to be inside that year. If you are planning a new fresh install, and not a conversion of an old winOS, it might be wise to wait a little. This month there should be an update, that allows a fresh install of win10 using a win7 or win8 key, but i’m sure they will announce it.