As of 1639 CDT, GOG is still only offering the 1.000 version for download. Neither the in-game updater nor the stand alone Arcen updater are working. Both result in an uninstall option (which works extremely well, although it was kind enough to ask if I wanted to retain my saves before it uninstalled).
I checked the GOG community and saw the message Keith posted about manually updating, went to the URL and DLed the four zip files (TLF_1001.zip through TLF_1004.zip). Then, following the info in the Arcen message "updating game on OSX 10.9.2", I copied the zipped files (still zipped) into the RuntimeData/updates folder.
I then manually ran the ArcenUpdater.exe from the UDA folder. Result is "TLF_1001 is not a valid numbered version file!" (as well as updates 2, 3, and 4.
Now what? I'd really like to be able to update this game. If I'd known it was going to be this difficult, I would have waited a few extra hours and purchased through steam. Extremely frustrated at this point.