Features of Macintosh OS X Lion. The principal variant of Mac OS X was Mac OS X Lion. Macintosh OS X lion – 1.2v3 depended on Rhapsody, a half and half of OPENSTEP from NeXT Computer and Mac OS 8.5.1. The GUI resembled a blend of Mac OS 8’s Platinum appearance with. Download Lion from the Mac App Store—but don't install it yet, because of the disappearing installer issue noted above. Find the installer in your Applications folder and right-click on it then.