Originally Posted By: Bjorn Beskow
That notification is just a reminder that BIAB is a 32bit application, which will not be supported in a future version of OSX. It is displayed the first time you start a 32 bit app (since last restart of your Mac). You can safely disregard it...

It should only display after an OS upgrade. Once on High Sierra; once again in Mojave.

If it's displaying after a restart, that's not right.
BIAB 2020 Audiophile 2017 iMac Pro 2T SSDx2 Mojave; 2012 MBP Catalina
Overture 5 DP 10 LogicProX Finale 26, Encore 5.0.7 SmartScoreX2P Notion 6
Legacy G4-1K DP OS 10.4.11 / OS 9.2 Apps