That is a bit of an annoyance with this pack. The easiest way would be to delete your assets folder and replace it with the backup you made when you installed it. Or if, like me, you didn't make a backup, simply "verify integrity" of game files through Steam. The download might take a while though. If that's an issue, you might be able to go through and delete specifically the files included in the mod. Much more tedious, but when you verify the game files it shouldn't take long at all.
Fortunately, in the next few days I should have a version that isn't so invasive and is just a folder you place in the DLC folder (like EUI if you use that). In that case, disabling is as easy as removing the folder.
Once that's out, I'd recommend everyone using the mod remove it in the above manner and use the updated version. It might be a pain, but will make enabling/disabling it much simpler.
Thanks for bearing with me on that.