Fotomagico Old Standalone player .app won't run on macOS Catalina

I have severa oldl Fotomagico standalone slideshow app that won’t run on macOS Catalina … Is there any quick way to convert them … I still have access to the package contents and have access to files needed to create .fms … Appreciate your advice… Tq

I think you should be able to simply rename the .app to .fms to open it in FotoMagico?

Also, is there an error message?

Yes… It really works … Didn’t know it was that simple… Thanks…