Click this official App Store link to macOS Catalina .

macOS Catalina on the App Store

Apple provides a direct link to the App Store for macOS Catalina. Click this official macOS Catalina App Store link . When the App Store opens, click the button.

A: The update (2.86 GB) only works if you are already on macOS 10.15.6. The full installer (≈8 GB) can be used on any compatible Mac, regardless of the currently installed OS version.

In the world of macOS, Apple doesn't keep old installers readily available on the App Store front page. Once a new major macOS version launches (like macOS Big Sur, Monterey, Ventura, Sonoma, or Sequoia), Apple hides the older ones. Furthermore, clicking "Get" on an old version often redirects you to System Settings > Software Update , which will only offer the latest macOS your hardware supports—not Catalina.

The Mac App Store will open automatically. Click the “” button to start downloading the Install macOS Catalina application. The download will save to your /Applications folder.

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sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/USB_DRIVE_NAME