I'm not sure where's the problem, but I'd like to help you.
1. which version of the game you play ? I've not tested it with older versions, but it should at least work with v0.6 and newer. You have all images dl and in images-folder and Mod.txt (exact this name!) in game-folder ? then let's go.
2. you have to do nothing special during shopping for this mod
3. at Sunday after the shopping event, you go to own room at 10:00, there you should have the option to
open the door
if not something wrong with your game.
4. after opened the door, you'll see this picture:
and your adventure begins. That's all
View attachment 51491
You may check also following: use the save-editor and check the variable
eric.inf in save-file you are playing. It should allways have the value 0 because it's up to v0.11 not used by the game. If not ( for whatever reason)set it to 0 (see image)
View attachment 51489
check the mod with a text-editor the lisa photo-session mod part should start with following:
liza.prepetitor@121@ ? Hmm, I wonder what Lisa's doing?
eric.inf=0&liza.mood>349&liza.gift^ <i>open the door</i>
eric.inf=0&liza.mood<350&liza.gift.no^ <i> locked ? </i>
eric.inf=1&liza.mood>349&liza.photo.lamps.no^ <i>locked</i>
eric.inf=1&liza.mood<350&liza.photo.lamps.nomood^ <i>locked</i>
eric.inf>1&liza.mood>349&liza.photo.shoot^ <i>open the door</i>
eric.inf>1&liza.mood<350&liza.gift.no^ <i> locked ? </i>
as you can see, the value eric.inf will be increased druring the event. and please check the mood (must be
>349). and please read in OP the "How to play". Thats all, what I can do.