If you are unable to upgrade, see How to create a bootable installer for Mac OS X 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 Mac OS X Lion 10.7. * If your Mac shipped with OS X Mountain Lion 10.8 or later, it cannot be downgraded to Mac OS X Lion 10.7.
See the Technical Specifications for the full list of requirements.
The latest supported software version is noted next to each model. You can install Mac OS X Lion on any of these Macs. Mac OS X Snow Leopard 10.6.6 or later or Mac OS X Lion 10.7 already installed.Mac OS X Lion 10.7 is available for older systems that are not compatible with the latest version of macOS.
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