i use the Lain Mod. its weird eveything else works fine but im stuck at the Tammy Guide Step 15. tells me to meet Erik in the basement but hes never there ... im also playing the cheated game to skip minigames
Well, I loaded your save, and in the to-do-list on your phone it says you should go to Erik's basement on the Weekend. So (it's Monday in your save) I slept a couple of times, then went to the basement on Saturday morning, immediately triggering the poker invitation event. Then I went upstairs to the hallway, and it triggered the yoga class event. So there does not seem to be any problem at all.
But I do not have Lain's mod installed, just my own Naughty Tribute. I would not say Lain breaks things, but if it does not work out for you, I suggest trying without it.
Happy gaming!