Running PL 2- should I upgrade to Big Sur?

Is it okay to do that or will I have problems?

Thanks.

See here: PL3 compatible with Big Sur?

The post will tell you what PhotoLab does on Big Sur, it will not tell you if you should upgrade or not. As a rule of thumb, one should not install the first release of a new OS unless one is willing to maybe have to live with an issue or two or twenty for a while :wink:

Upgrading to Big Sur (and Catalina) is pretty much one way unless you are prepared.
Check this page for hints on how to prepare for fallback.