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How to get old versions of macOS – Apple Support

Posted by jpluimers on 2022/03/11

Note just because of a Mac being incompatible, but also because of 32-bit apps being incompatible ruling out Cataline (10.15) or newer.

[Wayback] How to get old versions of macOS – Apple Support

If your Mac isn’t compadmgtible with the latest macOS, you might still be able to upgrade to an earlier macOS, such as macOS Catalina, Mojave, High Sierra, Sierra, or El Capitan.

Download macOS

It takes time to download and install macOS, so make sure that you’re plugged into AC power and have a reliable internet connection.

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.

links for 10.13 and newer on the Apple site are App-Store only, so you need to download, then save the installer in a safe place.

Alternative download methods and notes on certificate expirations:

–jeroen

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