moving from one version to another version of quartus quartus

Yes, but you should do a backup copy first, just in case.

I use multiple versions (different Quartus projects on different directories use the same source files via relative paths). It works great especially because I can compare results between the versions and I can easily go back when I find a regression.

I move a lot of project from 9.0 to 10.1 and from 10sp1 to 10.1 without problems.

i hope the same for you:))

Ale