Navigate to the installer that you want to use.Once you have the necessary files, you’re ready to install this version of macOS to your external hard drive: Install macOS on your external hard drive The easiest workaround, is to try and find another Mac user who’s willing to download the installer for you, as macOS installers aren’t user specific. If you want to run a version of macOS that you haven’t previously downloaded from the App Store, then things are going to get slightly trickier, as you won’t be able to download this version directly from the App Store.
This will download the installer to your Mac’s ‘Applications’ folder. 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.’.In the subsequent window, open the ‘Format’ dropdown and choose ‘Mac OS Extended (Journaled).’.In Disk Utility’s left-hand menu, select your root drive.In the upper-left corner of the Disk Utility app, select the ‘View’ button and make sure ‘Show All Devices’ is selected.Open a new Finder window and navigate to ‘Applications > Utilities.’.Connect the external drive to your Mac.Once you have a suitable hard drive, the first step is preparing this drive as a GUID partition: In order to install macOS, you’ll need an external drive with at least 12GB of free space.
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