Hello Krystyna. It was a happy accident that you came in here! I also started with PSP when it was JASC. I started at version 7, and have upgraded every year, ever since. PSP has not changed majorly over the years, although some new tools and features have been added or modified over the different versions, but overall, it should not be too hard if you are already familiar with the interface.
Looking forward to your projects!
