FYI. It’s 64-bit, as the new Mac OS requires. There is also the BIAB VST Plugin, with its own new forum. The add-ons bring it comparable to the Windows 2019 version (except for RealBand).

https://www.pgmusic.com/bbmac.htm
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BIAB 2021 Win Audiophile & 2020 Mac UltraPak. Software: Studio One 5, Adobe Audition CC, Notion 6; Win 10 64 Pro. Hardware: custom i7 16 Gb; Roland Integra-7, Presonus Studio 192, Behringer X-Touch, Adam sub & monitors.