This article will be kept up to date with any details about the compatibility between Vectorworks and macOS 10.15 Catalina:
Are you testing on Catalina? Please use the comments to give us your feedback or to report issues.
We have been working with the latest beta versions of Catalina with Vectorworks 2020 successfully. However, I will ask the community to wait for a day or two until we finish the testing with the released version that in some or most cases can be different than the latest beta released.