So I had a macbook air, and updated it to mountain lion, only to find that sera to Itch (I am a DJ) is not compatible. I needed a computer that worked with it, and was in need of a new computer anyways, so I went out today to buy a rMBP. The problem: I need to transfer everything from my old MBA to my rMBP, without transferring mountain lion. I do have an external hard drive, but the latest update was with mountain lion using time machine. Anyone have any ideas on how I can transfer everything besides Mountain Lion to my new computer?