Question marked as Top-ranking reply User profile for user: Niel Niel User level: Level 10 731,753 points Feb 8, 2022 8:47 PM in response to Reedetr Back up your data, check your applications for compatibility, and if your iMac is a 2012 or newer model, click on Catalina.Catalina and newer won't run 32-bit software; download and use Go64 to scan for it. To check other programs, click here and look them up.(213846) Show more Less Reply Link