Hello everybody, I have a 15' rMBP Mid 2012. I been having some issues with OS X Mavericks and would like to go back to OS X Mountain Lion 10.8. Refer to this thread to find out my problems: http://forums.macrumors.com/showthread.php?t=1668874&highlight=is+it+just+me How can I go about in doing so? & where can I get Mountain Lion 10.8, it seems not to be in the Mac App Store. Thanks!