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Apart from this, some older versions of macOS are available for direct download from Apple (Sierra, EL Capitan, Yosemite) in DMG format. Confirm that the USB drive will lose it’s data and enter the Admin password when asked Disk Utility will now create a bootable OS X Mountain Lion installer drive out of USB drive using the disk image, this can take a little while depending on how fast the drive and Mac … If you want to go back to your previous macOS, here's how to … Connect the USB to your MacBook. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. OS reinstallation may sound a bit complicated, but with DAEMON Tools everything becomes handier.