Can't Revert Dev Startup to 1.5.2

I have been running on MinecraftDev as my start engine for the Mac. Until recently, I have been able to choose what version I wish to use until recently. Is there a way I can revert back to 1.5.2 so i can get back to the Multiplayer servers I'm on?
(I would also like to point out that I tried to mark this issue as a new feature, but it would only change it back to a bug issue type)