StarTools

Hi. The 1.4.312 package contains the 1.4.305 alpha version for Mac (at least that's what it reports as, and is the same executable I had downloaded a few months ago). Also, while the other executables have the date of the release as the file date, for the Mac version the .app folder (which is what you see in the file list) has a Jan 1 2013 date so you have to check the actual binary inside to find the release date (July 22 in this case). Minor detail of course.
Happy holidays!

*crickets*

Oops. Sorry, missed this one.

It's a bit of an oversight on my part, but you're actually not missing anything; any updates since 1.4.305 have been windows specific. Therefore the executable has not been recompiled (and the build number was not updated).
i.e. 1.4.305 and 1.4.312 are functionally identical.