Mac OS X 10.7 Lion Developer Preview 4 2011
 

This is the latest beta that has been submitted to all Apple Developers. To install this you'll have to mount the DMG into a disc and or to a flash drive, search on youtube or google for further instructions on how to do this.

Note: This install does not require the previous beta build, Also you need to have your harddrive using a GUID partition scheme for this to install correctly. Also id advice that you back up your system before installing this as with any OS.
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Respuesta: Mac OS X 10.7 Lion Developer Preview 4 2011