The stars_by_soverign.zip file you have requested: The Outdated Abyss / Soveriegn's Starfield - 640.41kb is not available. Perhaps try browsing all files for the game Star Trek: Bridge Commander and upload any files you want to share or are missing. This is the only information we could locate:
This is another fine starfield for download. This is pretty close to canon so if you like realism. This is the one to have.