Uninstalled Sins and re-downloaded the entire thing. Game crashes to the send report screen upon launch. *sigh*
Update:
Sins briefly verified as being installed correctly, but would not run. Verified Entrenchment and updated it when it was wrong. Game ran. Entrenchment still says it's installed incorrectly. In summation, game gets to opening menu now, but both Sins and Entrenchment selections on Impulse say they're installed wrong and need to be updated endlessly.
So yeah, color me confused. There was a 23 MB update for Sins and a 7 MB update for Entrenchment. Second update for Entrench was a few kilobytes. Now regular Sins wants the 23 MB update again. *bash head on keyboard*
After running the game for a few minutes, I notice that any units having to do with Entrenchment have missing UI icons. Phasic cloaking, Detonate ability, Raloz and Ogrov cruisers, etc. I think I'm going to bed, but I assume the fix is to wipe Entrenchment. Guess all I can do is archive Sins and then wipe everything related to the Stardock files.