Find the version of macOS that you want to install, and then click its accompanying ‘Install’ button.If you want to install a version of macOS that you previously downloaded from the App Store, then you can just re-download the necessary installer: The next step, is downloading the installer for the version of macOS that you want to run from your external hard drive. Once the process is complete, click ‘Done.’ Disk Utility will now create the partition and setup the drive, which may take a few minutes.Open the ‘Scheme’ dropdown and choose ‘GUID Partition Map.’.
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