From UC 3.1.2 release notes:
Universal Control 1.7.6 for FireWire products (including the StudioLive 16.0.2 Classic) still works on Windows 7, 8.1, and 10, as well as Mac OS X 10.8.5—macOS 10.14 Mojave. However, it will not be available on macOS 10.15 Catalina or future macOS versions. Users of these products are advised not to update their systems beyond macOS 10.14 Mojave.
I have no idea why this wasn't communicated on the support pages for FireStudio products but I suspect, like me, it left many users of FireStudio products in the dark and waiting for something that was never coming. Though I appreciate the long run the FireStudio had, I'm very unhappy on how the end of driver support was communicated.