Yeah, since I bought a Jeep with a MyGig in it and needed to upgrade the software, I got very familiar with an unofficial website. I posted there so much and answered so many folks' questions, they asked me to be a moderator.
Dealers seem to have no clue about the MyGig and how it works and how to upgrade it...
2.067 is a modified version of 2.043 which adds the GPS clock function. This is mainly for older vehicles that were not originally compatible with MyGig. These older vehicles would only show 12:00 on the mygig clock display.
Some egghead discovered that you could tell the radio to just get the time from the Nav satellite data, which solves the clock problem.
2.063 is another mod of 2.043 which adds a fix for older iPods with charging problems.
2.107 is the latest version released by Chrysler, as far as I know.
All of these versions will work on RER/REW/REP radios.