UPDATED: macOS Catalina Statement
UPDATE: Kazrog has announced preliminary support for macOS Catalina, as of October 16, 2019. While more thorough testing has yet to be done, we can confirm that our current plugins are working in hosts that officially support Catalina at this time.
However, we strongly discourage most people working in the pro audio industry from upgrading to Catalina, due to widespread incompatibility with a variety of audio software and hardware as of this writing.
Pro Tools Expert has a comprehensive list of compatibility information from a wide range of manufacturers in our industry.