![]() To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. OS X Mountain Lion 10.8 can upgrade Lion, Snow Leopard.You might find it easiest to begin installation in the evening so that it can complete overnight, if needed. ![]() During installation, it might restart and show a progress bar or blank screen several times. ![]() Please allow installation to complete without putting your Mac to sleep or closing its lid. Open that app from your Applications folder to begin installing the operating system. It installs an app named Install OS X Mountain Lion. Safari downloads the following installer as a disk image named InstallMacOSX.dmg. To upgrade from Mac OS X Lion 10.7, download and install OS X Mountain Lion 10.8.5. To upgrade from Mac OS X Snow Leopard 10.6, download and install Mac OS X 10.6.8 Update Combo v1.1 followed by OS X Mountain Lion 10.8.5. If you are unable to upgrade, see How to create a bootable installer for OS X Mountain Lion below. ![]() To upgrade from Mac OS X Tiger 10.4 or Mac OS X Leopard 10.5, first upgrade to Mac OS X Snow Leopard 10.6, then upgrade to OS X Mountain Lion 10.8. * If your Mac shipped with OS X Mavericks 10.9 or later, it cannot be downgraded to OS X Mountain Lion 10.8.ΔΆ. Mac Pro (Mid 2010) | 10.14.6 with recommended Metal-capable graphics cards.Mac Pro (Mid 2012) | 10.14.6 with recommended Metal-capable graphics cards.MacBook Air (11-inch, Mid 2013)* | Latest release of macOS.MacBook Air (13-inch, Mid 2013)* | Latest release of macOS.See the Technical Specifications for the full list of requirements. The latest supported software version is noted next to each model. You can install OS X Mountain Lion on any of these Macs. Mac OS X Snow Leopard 10.6.8, Mac OS X Lion 10.7, or OS X Mountain Lion 10.8 already installed.OS X Mountain Lion 10.8 is available for older systems that are not compatible with the latest version of macOS.
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