How to run Mojave on an old MacĪpple advises that macOS Mojave will run on the following Macs: Installing macOS via a Bootable Installer here. If you are running a version of macOS that predates High Sierra or Mojave, you will need to format your hard drive to APFS. When it reboots, your Mac should now boot into a fully working copy of macOS Catalina.When the patches have been applied choose Force Cache Rebuild.Now choose macOS Post Install and the required patches will be installed on your Mac so that Catalina can work.After the installation has completed, you should restart the Mac in Recovery mode again, choosing the drive that contains the bootable installer. Choose Reinstall macOS and wait for the new version of macOS to install.Choose the bootable installer drive and Enter.This will cause the Mac open in Startup Manager. Restart the Mac while holding the Option/Alt key.Plug the bootable installer into the Mac you wish to update.Choose ‘Create a bootable installer’ from the options.The download (of Catalina) will start – since it’s almost 8GB it is likely to take a while.Download the latest version of the Catalina patch here.The script is part of the patch for macOS Big Sur and changes important settings for booting and system files. After preparing the Mac with the USB stick, start a terminal and enter “/ Volumes / Image Volume / set-vars.sh”. These can be found in the instructions for big-sur-micropatcher. In some cases, there are still tasks to be performed after the installation.
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