The reason this is news to RISC OS users is that one big feature is the removal of support for 32bit applications. This has been announced for some time but finally happens in this release. If you remember the RISC OS move from 26bit to 32bit you will appreciate this is the point where some applications stop working unless updated. And it may break the Mac RISC OS emulator you are using....
When you run the MacOS installer, it tells you which applications will no longer work. You will see my copy of both VirtualRPC and RPCEmu are on the list.
After the update, you will get this message if you try and run VirtualRPC.
So if you currently want to run RISC OS emulation on a recent Mac machine, you may want to delay upgrading to Catalina.
We will be looking at RISC OS emulation options for Catalina in a later article....
