Sims Medieval Installation Verification Failure

Redeemed a code for this game, installed it, got through the intro cutscenes (Patrick Stewart, wonderful as always,) but once I get to the main menu, a popup saying that the installation is incomplete blocks me from going any further. Clicking the check returns me to the desktop. I've tried repairing and reinstalling the game, but neither works. 

(Pardon potato quality, it didn't like me trying to screenshot it.)