I'm surprised that you haven't kept up forum posting concerning this particular problem.  PP2014 should operate fine under Windows 11, the issue that is most likely the cause is the floating Library panel.  If it is docked, the program will not behave as it should subsequently it shuts down when attempting to open.  There is an internal change that you need to perform, however, for the life of me, I can't remember in which thread it was posted.  Someone should come along with that information.