Will probably mention this in a dev blog at some point but just to get this out there now...
The Mac Repair Tool has been discontinued, the reason for this is that we now have something that does exactly the same thing which is the generic patch.
You can download it from a link that is posted at the bottom of the mac patches page
for Tranquility and the other test servers (menu here on the left -> EVE DOWNLOAD -> EVE Patches -> Tranquility (Live)).
Each generic patch is fixed to a specific build number so each time there is an update you will have to download the new generic patch for that new update.