Just so there's no misunderstanding, there's only one CG available in the DLC right now. But if that's the CG that you're having issues with, then I'd suggest making sure the DLC folder is called "14 Nights With You" and not "14nightswithyou-free" or "14nightswithyou-paid".
If that's the case, then you'll need to open that folder and replace it with the "14 Nights With You" folder instead.