Thanks for the screenshot - that saves a few back and forth questions.
STICK is trying to download the correct file and that file is definitely available on the autobuild server (I just downloaded it as a test).
The author of STICK has kind of thrown his hands up in the air with frustration of getting all the MacOS variants to work cleanly. But did you see the note about how to launch STICK ?
'stick.command' - a shell script for OSX (up to Lion)
'stickML.command' - a shell script for OSX Mountain Lion and later versions (see below)[
There are other suggestions on the STICK webpage :
http://zenoshrdlu.com/stick/stick.html Does any of that help?