We've supported some products that have been on the MacOS platform since the late 1980s. Catalina compatibility is not going to happen and there will be no further development. It's been too much time treading water and hasn't been profitable for sometime even though we are the preeminent application in our domain and none of our competitors are replacements. Customers have been, are, and will be following us to the Windows version.

Good software takes 10 years. Great software takes 20 years.

If you have to spend all your time rewriting though just to stay in place it never gets great. Instead you just introduce instabilities and incompatibilities for no good reason other than fashion and hardware sales for a competitor.