Yes, indeed, I am running Catalina, which explains much. Sadly, I have little choice because of my development work. I just hope it eventually works. I can capture the audio externally, which is what i’ve been doing, but that is slow because it has to be done in realtime and it’s glitchy in the same way that there are often playback errors when playing live within Dorico. It’s certainly not an issue, that, when it buffers or glitches here and there but when it’s being captured, it’s rather unfortunate. I shall just have to wait for full compatibility but it is staggeringly annoying that this is a licensing issue rather than actual compatibility of the software itself.
It’s a 2015 MBP 15.6 i7, btw.