well I tried over and over and only got 6 total... got one CG from it but still missing the last one... I have all the other backgrounds and CGs, oh well will give up on that one
I assume you're playing with the adult patch (from https://aags.bobcgames.com/?patch) ?
Try applying this adult patch to your game instead... I've reduced the requirements in this patch to 3 and 6 (from 5 and 10)
https://drive.google.com/file/d/1A9IpW1n-wFQl-9cyNCrjdNxweebXK4Bi/view?usp=shari...
(The CG is too good for you to miss ;) )