Moving Forward: How to Upgrade from High Sierra (10.13.6) to macOS Catalina (10.15)
October 26, 2023 Subject: System Upgrade Path and Migration Strategy Target Audience: Mac Users, System Administrators, and IT Support Staff
: Use Time Machine to create a full system backup before proceeding.
(using an iPad as a second display), plus improved security. Major Warning : Catalina is the first macOS to drop all support for 32-bit applications