Fusion is 12.1.2.
The bare-metal support isn't going to work, because it is for virtualized macOS 11 (Big Sur) VMs. Avernum 6 is definitely not supported in that (BigSur) OS.
My Avernum 4-5-6 disc is Mac only, which is why I have been trying to get a Mac VM up and running that can support 6. As a test, I fired up a Win10 VM and the demo version of Avernum 6 seems to work A-OK there.