Click on Continue, select the destination drive, and install. My friend got an iMac that came with Snow Leopard, and he never upgraded to Lion, and he upgraded to Mountain Lion and he said 'My iMac hasnt became slower, maybe a little faster' and i own a rMBP and when i got it, it came with Lion and with ML its much faster So i think ML is a good upgrade. Select the orange “Mac OS X” option and you will boot into the OS X Mountain Lion installer, from here installation is the same as normal. When finished, reboot the Mac and hold down the Option key to bring up the boot menu: Confirm that the USB drive will lose it’s data and enter the Admin password when askedĭisk 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 are but 20-30 minutes isn’t unusual. Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage). Drag the formatted partition to the “Destination” section, then click on “Restore” Install older OS X onto an external drive The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks.Drag the previously mounted “Mac OS X Install ESD” image into the “Source” section.Now select the formatted USB drive from the left side and click on the “Restore” tab.Select the USB drive from the left menu and click on “Erase” tab, choose “Mac OS X Extended (Journaled)” as the format, then click on the “Erase” button in the corner.Launch Disk utility and connect a USB drive to the Mac.Make the OS X Mountain Lion Install Drive Double-click on InstallESD.dmg to mount it on the desktop.Wait until it is load and show HackBoot CD icon b) change the disk to 'OS X 10.8 Mountain Lion bootable DVD'. Install MacOS Mountain Lion a) insert disk 'HackBoot 1.iso' and run virtual machine. Open the “Contents” directory and then open “SharedSupport”, looking for a file named “InstallESD.dmg” Leopard, you should use the Disk Utility instructions. Download OS X Lion and Copy It to Your Flash Drive Now that your USB flash drive is prepared, move on to downloading OS X Lion and copying the installer to the drive.Go to the /Applications/ directory and right-click on “Install Mac OS X Mountain Lion.app” selecting “Show Package Contents”.Download OS X 10.8 Mountain Lion from the App Store.Download OS X Mountain Lion and Extract the DMG File If you already have the Mac OS X Mountain Lion install DMG extracted, skip this first set of steps and jump directly to making the bootable drive below. We’ll walk through the process here, but don’t forget to check OS X 10.8 system requirements for the destination Mac before beginning. By creating a bootable install drive, you can perform clean OS X 10.8 installs, install it on separate partitions, and install OS X Mountain Lion on Macs that don’t have internet connections.
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