Mac OS X 10.7 LionMac OS X 10.7 - 11A419 (March 30, 2011)OK. This is the .dmg found inside the .app that the developers had to download from the Mac App Store. Burn it orrestore it on a flash or HD drive to boot it from it.Mac OS X Lion v10.7 Developer Preview 11A419 (March 30, 2011)Apple released a Developer Preview of Mac OS X 10.7 Lion, included are many features that were seen in the October“