HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedMar 2, 2013 12:49 PM (in response to TommyG65)
You have to call 1-800-MY-APPLE and purchase ($20) the access code for Lion from the MAS.
Currently Being ModeratedMar 2, 2013 1:16 PM (in response to Ralph Landry1)
Lion requires a Mac with a Core 2 Duo(not Core Duo) or better CPU and at least 2GB of RAM. If the computer's compatible with Mac OS X 10.8, it's easier to upgrade directly.