I'm not sure how amupdate works, but when I run it from the launchpad on my mac it only shows an error message (see attachment).
I would rather download a fresh build again and install it manually, but even if there's a fix for this crash there's no really a reason to have an update icon hanging around together with other application icons in os x launchpad.
Suggestions:
-remove amupdate from launchpad
-make amupdate in launchpad optional
-write up an FAQ entry about how to remove amupdate from launchpad
-make sure amupdate doesn't put itseld back in launchpad after every update