I had trouble installing a Prism update. Can I restore the old version?

The installer puts the old prism.exe file in a backup folder. For example, if you updated to Prism 3.0x and accepted the default installation folder, you should find the old Prism program file in ...\program files\prism3\backup. Simply replace the newer prism.exe file, in ...\program files\prism3, with the older one.