With these companies now saying do not upgrade the OS I fully understand why PG Music has said nothing about BiaB Mac 2019. It will be interesting to see if any other type of software companies come out with similar announcements.
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MacBook Pro - Big Sur 11.0.1
Yamaha SLG200N
Arturia Keystep

Logic Pro X, BiaB Ultrapak 2020 Mac,
Xtra Styles 1 - 10. Loops-with-Style PAK 1 & 2. Multistyles PAK 1.