: Your Mac will ask if you want to download macOS Catalina. Click Download to start.

Select from the utilities window and follow the prompts. Important Considerations

: While original support ended in 2022, recent security updates have been released to maintain essential services like iMessage and FaceTime through early 2027.

If you need to reinstall the OS on a Mac that already supports it, you don't need to download a separate file first:

: Catalina was the first macOS to drop support for 32-bit apps. Before installing, verify your essential software is 64-bit compatible.

: Ensure your Mac has at least 4GB of RAM and 12.5GB of available storage .