I had a very old version of CSP (I had updated from when it was Manga Studio) and I have apparently been using CSP 1.5.4 this entire time. Recently I've been having a lot of lag issues with my version. Cursor will just halt mid stroke and freeze for a little bit. Maybe it was new graphic drivers causing it or something, but I took this as the opportunity to update my version to hopefully resolve this issue. My product serial number is not recognized in newer versions and even when I go back to my broken 1.5.4 version it won't let me register it and says my license expired, but it was a single purchase and I thought it was just the perpetual one time purchase.

Has anyone else dealt with this? I'm interested in trying some of the newer features, but not sure if it is worth buying the SW I already have all over again.