![]() ![]() Open PowerISO and continue unregistered.Step 3: Open a new Finder window, and navigate to the Applications folder. I suggest naming it something recognizable, like Mountain Lion Boot Drive, Mountain Lion USB Key, etc. Now that you’ve prepared your USB drive and downloaded the needed macOS version, you are ready to move on to the most important part of the process. Mountain Lion 10.8.3 is a very powerful and reliable operating system for your Macintosh computer with different enhancements and improvements. Step 2: Open the Disk Utility and erase the 8GB USB drive. To download these operating system versions, click the needed link: OS X Mavericks. Download Mac OS X Mountain Lion 10.8.3 full version OS setup free. Snow Leopard is no longer maintained by Apple: security risks abound Mountain Lion, Mavericks, etc will not boot on standard MacPro 1,1 (the firmware is 32-bit not 64-bit, and Lion is the last OS X that will boot on the bogstandard machine) and I didn't want to go through the pain of a non-straightforward boot / install process (though there. Step 1: Download OS X Mountain Lion from the Mac App Store. Step 4: Open the Contents folder, followed by the Shared Support folder, and locate InstallESD.dmg. Right click on the app, and select Show Package Contents. This is the Mountain Lion installation app that was downloaded from the Mac App Store. Inside, you should see the following: Install OS X Mountain Lion.app.
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