Starting with macOS Catalina (10.15), Apple officially killed 32-bit application support. For most users, this is a downside. However, for creative professionals and legacy gamers, it is a sanctuary. If you have a library of older music production plugins (VSTs), classic games (like BioShock Infinite or Diablo III ), or enterprise software that never got a 64-bit update, Catalina is the last train you can catch.