There's an issue with running COMP/CON (and all non-apple-certified electron apps in general) in OSX Catalina. I've heard of some workarounds (search run electron app catalina) but I'd suggest trying the web-based version at https://compcon.app.
I'm ~80% done with C/C version 2, and once that work's done, I'll work on getting the app running without warnings on OSX
