interesting, I also have the 404 error, BUT the file is STILL in my public dropbox area, and here is a link to the latest of the rebel compatable map updaters (https://dl.dropboxusercontent.com/u/8023186/sins%20modding%20utilities/rebelmapupdater3.exe), that I just got from the dropbox site page, so hopefully it will work for all (just tested with another browser and it (the links above) work, looks like dropbox went and changed things for the shared files links
I've tried updating a few maps I made for Trinity some years ago. (Galaxy Forge)
I downloaded your EXE using the updated link you posted and put the maps (and your EXE) in the GalaxyForge folder under My Documents. Your program finds the maps correctly, but updates none. (It says 0 out of X maps updated and no maps appear in the right column.)
Targetsinsver.txt is not on my PC.
I've uploaded my maps (link below) but would appreciate it if you could tell me what I am doing wrong. Thanks.