Mac OS Catalina please help
“This app” works on Catalina, but you may need to resolve a few lockups. You don’t say anything neither about what software you have nor what symptoms you see (where does it stop?)…
The latest versions can be downloaded here. Try the “stable” 6.3 version first.
Find the solution to one frequently encountered problem in this answer.
6.4 is also a “stable” version and more up-to-date than 6.3