I wonder if rather than upgrading, I could put the 3.1 in another folder and run
both versions together (finishing a render with 3.0.10 and starting to play with 3.1).
Of course, i don't want to take any risk to crash the 3.0.10 while rendering.
I do that always, just make a new folder in advance (in Program Files under Planetside) and choose that folder when installing, instead of the default.
Now it is time to play. ;D
You can open two (or more) of the same version at the same time depending of your RAM.
If you don't play with the same scene there isn't much to fear.
I leave mostly one CPU core free for other things like that at rendering.