How to download an older version of osx
Dec 1, 2019 Want to downgrade your Mac to a previous version of macOS? screen loads, choose Reinstall macOS (or Reinstall OS X) and click Continue. it was possible to download older versions of macOS through the App Store. I found some Mac App Store links that direct to old macOS installers. It will display the page for the version, where you can click "Get" to download the installer