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If you already have an earlier version of 10.8, you can jump straight to the 10.8.3 features by downloading the OS X Mountain Lion Update v10.8.3 (Combo) . Minimum System Requirements

was a landmark release in Apple's transition toward integrating desktop and mobile experiences. Released on March 14, 2013 , version 10.8.3 brought critical stability fixes, such as support for Boot Camp with Windows 8 and 3TB hard drives. mac os x 10.8.3 mountain lion iso download

Apple Developer account holders (even free tier) can access: If you already have an earlier version of 10