Apple has just released (yesterday) macOS Catalina (10.15). While the new version brings several new features and other improvements for you Mac, please do NOT upgrade yet to it.
Future.dj pro (and the regular future.dj) is NOT yet compatible with macOS Catalina. We are working to have a new version ready that will be fully compatible but at the moment we strongly recommend you do not upgrade if you still want to use our DJ Software for your Mac.
We will announce once the new version is ready. Stay tuned!