Could you please show a screenshot of what the "No CG" error looks like??
And just so there's no misunderstanding, are you positive you're not confusing the error message with the "no CG yet" placeholder image for future CGs?? This is mentioned in the DLC's description, but there's currently only one 18+ CG available in the demo right now.
So, if im on day 2 and it says no cg yet, thats normal?