Installing Mac OS X Mountain lion Apple iD Error Can someone please help me with this Issue? Im trying to install mountain lion and i always get this error! My Mac Is a 2007 iMac, kind of second hand, 320.07 GB WDC Hard drive.
It means that the Apple ID that you signed in with has no record of purchasing Mountain Lion. If you purchased Mountain Lion, use the Apple ID that you used to purchase it.

Alternatively, install Mavericks as it's free.