The Mac must also be using macOS High Sierra or later, the latest version of macOS Sierra, or the latest version of OS X El Capitan. To download an installer suitable for creating a bootable installer, use the App Store or use a web browser to download from a compatible Mac. (These instructions are geared to GnuPG and Unix command-line users. For Intel Macs, you can do this by holding Cmd + R on startup. Follow the onscreen installation instructions.Ī bootable installer can be useful if you want to install macOS on multiple computers without downloading the installer each time, or when you can't install using the other methods. To verify the authenticity of the download, grab both files and then run this command: gpg -verify Python-3.6.2.tgz.asc Note that you must use the name of the signature file, and you should use the one thats appropriate to the download youre verifying. Finally, here’s how to install an older version of macOS using the installer you just created: Shut down the Mac you want to downgrade and plug in the newly created external drive. Open your Applications folder and double-click the macOS installer, named Install. pkg file, then follow the onscreen instructions to install the macOS installer into your Applications folder. dmg file to open it and see the package (.pkg) file within.ĭouble-click the. Use these links to download a macOS disk image (.dmg) file.ĭouble-click the.
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