The Finale Site License Monitor (SLM), offered by MakeMusic to support Finale authorization in a network environment, is not compatible with macOS 10.15 Catalina. It is our recommendation to avoid upgrading servers running the Site License Monitor service to 10.15. At this time, there are no further SLM updates planned for macOS.
Client workstations on a network are not affected by this incompatibility. Windows servers will continue to be supported, and as always, Mac workstations can connect to Windows servers for authorization management.
If you must upgrade your Mac server to macOS 10.15 Catalina, Finale recommends using a third-party license management software, like KeyServer by Sassafras, or similar software in this situation. Workstations can also be authorized individually through the Finale application.