![]() Create an Install DVD (see instructions below).Create an Emergency Boot Drive for macOS / OS X / Mac OS X you can use it to boot your computer and repair your hard disk and/or reinstall macOS / OS X / Mac OS X.Create an External Installation Device.You can now use the macOS / OS X disc image (InstallESD.dmg) to:.Navigate to Contents > SharedSupport and locate the 'InstallESD.dmg' file.Right/control click on the 'Install macOS / OS X' installer package and select 'Show Package Contents' from the contextual menu.'Install macOS High Sierra') or find your backup copy of it. Go to Macintosh HD > Applications and locate the 'Install macOS / OS X version name here' installer package (e.g.Now choose what you want to do with the macOS / OS X disc image.Copy the 'InstallESD.dmg' file to your desktop or preferably to another disk/storage device or even burn it to a DVD so that you have a backup of it.There should be a folder on it called 'macOS / OS X Install Data' that contains a disk image file called 'InstallESD.dmg' - if this is missing, then you probably waited too long to unplug the drive.The Mac may stall for moment but then should boot normally to your desktop or login screen.When the Mac automatically restarts there will be a black screen for a moment - at this point unplug/eject/disconnect the external storage device.Let the installation start and watch the installation process carefully (it may take a while as it is 4.3GB+ in size).Choose your external storage device as the destination.When the macOS / OS X Utilities window appears select the Install macOS / OS X option.Restart your computer using the (Internet) Recovery mode.NOTE: The external storage device must be at least 8GB in size and erased/empty/formatted as a GUID Partition before use. SDXC card (if your Mac supports it e.g. ![]() NOTE: If you have an additional compatible Mac running Mac OS X 10.6.6 or later that does not have the version of macOS / OS X you want already installed on it you could use that to download the installer again otherwise you will need one of the following external storage devices before continuing with these instructions: Go to Macintosh HD > Applications and check for an 'Install macOS / OS X' item - if it exists go to the Obtain The macOS / OS X Disc Image section below otherwise continue with these instructions.Obtain the macOS / OS X Installer - macOS / OS X Already Purchased And Installed ![]()
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