Prepare it for use by creating a single HFS+ partition. Attach a thumb drive to your Mac that is at least 8GB in size. Navigate to /Applications/Utilities and launch DiskUtility.Ĥ. Open a new Finder window with Command-N (File > New Finder Window). There you'll find a disk image called InstallESD.dmg.ģ. A new Finder browser window opens, showing the normally hidden material inside the installer bundle.Ģ. Right-click (or Control-click) the installer and choose Show Package Contents from the contextual pop-up. It is called Install Mac OS X Mountain Lion.ġ. Once the large multi-GB installer finishes downloading, go to your Applications folder to find the installer itself. You can use this option-click-Purchases trick to re-download any purchase, not just Mountain Lion. An "Install" button should appear next to Mountain Lion. Launch the App Store and option-click the Purchases tab. If not, you'll need to re-download it from the Mac App Store. If you saved a copy when you first installed Mountain Lion, great. You'll need a copy of the OS X Mountain Lion installer. This year, I update those instructions for Mountain Lion. Last year, I posted about creating a standalone Lion USB installer thumb drive.
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