MacPostFactor 1.0 has been officially released:
Download (direct link)
MacPostFactor is a tool to install Mac OSX 10.8+ on older (Intel) Macbooks that only support up to OSX 10.7 (Lion). It works through a combination of a highly customized installer, a replaced set of drivers and various frameworks, and the original install app from the App Store. The installation can be done directly on a Macbook already running OSX Lion (so no USB disk required), or on an USB media for installation on another system.
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