As Bjorn suggests, the system message has nothing to do with any problems you may experience. It will display the first time you run any 32 bit application in High Sierra or Mojave.

If you saw them already in OS 10.13.x, you will see them again in 10.14.x with one difference: 32 bit Apple processes also display the message in Mojave—weird since the developer is Apple.


BIAB 2024 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5