So due to some graphical errors I decided to uninstall the high resolution DLC, and reinstall it. Problem is, I can't reinstall it. Steam still thinks I have it installed, but the esp is no longer there in data files (I hit "delete selected"). Is there a way to reinstall the DLC by itself without having to reinstall the entire game again?

Verify game integrity.

That worked, thanks muchly. (b'-')b