A potentially useful article on getting Aperture and a few other oldies to run under Catalina.
I have not used it - strictly Mohave here yet - I need a new new Mac Pro before migrating to Catalina.
Well, well, well, what a coincidence; I've been struggling for two days trying to discover why I can't make Aperture do what it did perfectly well two years ago, to no avail. It seems to be very unstable and has been driving me to distraction. Have you used it to make slideshows?