Apple on Monday released macOS Catalina to the public, allowing everyone to install the newest version of the operating system for the Mac. Based on reports on the MacRumors forums, Twitter,. The problem we face when putting Catalina on older Macs is that, hidden deep within the operating system itself, there is a script that checks what machine you are trying to install it on. If this script detects that your chosen machine is too old, the Catalina installer will quit automatically.
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