Enter your Apple ID and password if asked.This may take up between 10 and 60 minutes, depending on your Internet connection speed.Look for OS X Mountain Lion, hold down the Option key and click Download.ĭownload Mountain Lion to create bootable USB Install Media.Launch App Store, and go to the Purchases tab.Here’s how you can download and obtain a soft copy of Mountain Lion. If your Mac ran OS X Mountain Lion at any point in the past or if you have previously purchased it, you can download it again from the Mac App Store and create a bootable USB flash drive with it. In order to make a bootable Mountain Lios USB intaller disk the first thing you need to do is to get a copy of the installation file of Mountain Lion. How to create a Mountain Lion Bootable USB installer drive? If your want to make a handy emergency recovery disk, create a Mountain Lion USB installer disk.If you want to install OS X on a Hackintosh you need an external media to boot and install from so a bootable USB installer drive for Mountain Lion will be handy here as well.

If your Mac has a corrupt or damaged operating System that does not boot and you do not have a faster and reliable internet connection, you can perform clean OS X 10.8 installation from the bootable USB installer.Therefore, you are required to either make a copy of the installer outside of the default Applications folder or make your own bootable USB installer disk before upgrading. The Mountain Lion installer is set to self-destruct the necessary file needed to install once it runs and you will need to redownload it if you want to install it again.So if you need to install it on multiple Macs, a bootable USB installer drive can be more convenient than copying or downloading the entire file to each computer. Your copy of Mountain Lion can be installed on as many number of Macs as you want at no extra cost.

Mac os x mountain lion install disk