A general warning to old timers who have old Panorama files tucked away on your hard drives where you have not opened them for many years. Before you upgrade to Catalina, make sure you open those old Panorama files in Panorama 6 and save them while using the pre-Catalina OS. You will not simply be able to add the .pan to an old Panorama file and then expect Panorama X to be able to open it. It must have been saved in Panorama 6 prior to taking it to Panorama X.
Panorama 6 came out in 2010. A Finder window will show you the last modified date of a document. When I view a Panorama file that was last modified in 1996, it thus tells me that I’d better open it and Save it in Panorama 6 (and add the .pan extension) so that it will be openable in Panorama X should I ever want to view that file.