Kommt vermutlich analog zu Mojave später.
macOS 10.15 Catalina on Unsupported Macs:
https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/page-2#post-27417541
https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/page-2#post-27417541