The good news is you can install windows on the Mac hardware and Biab will keep working update after update after update.
The generate issue speed with Biab can can be fixed by playing the files direct from the hard drive like all DAWs do rather than piecing it altogether and loading it into RAM first. It was made to generate then play like this because of old 90's hardware thinking.
I showed this working in Reaper and it's instant, even 255 bars, it has absolutely no problem. So the BBPlugin can work this way NOW so it will be way quicker than the current Biab way, instant, this too has also been shown with real examples using the RealTrack source files.

All this I have shown with more real examples using the source files that Biab working this way can be a live arranger working from midi keyboard input playing any chosen style live on stage.
So no need to spend $6000 on an arranger keyboard.

Every other software is crossplatform programming so it's released at the same time with same features Win Lin Mac.

All this is absolutely no problem, the hardest issue is getting PG out of it's 90's thinking.

It's a no brainer !