First of all, I walked around in circles forever in that giant room with all the locked side doors, a bunch of lockers, and the gate leading to all the dead bodies. Finally, I read on the comments for this mod on Moddb that you can hop over it so I did that, though I still have no clue how to get over normally.
Spoiler below!
After that, I got through to the next room, got the key to my room, and.....I locked it from the outside. From watching videos of it I see you have to lock it from the inside and then you can progress, but now I have no way to get in. That's kinda a problem I think.
Anyway, what should I do? I really like it so far but am not sure if I want to start all over again just to play the remaining parts of it.....ugh!
Also my post was formatted weird for some reason haha.
Recently, I encountered a group of people with similar problems. The main reason seem to be that both models and monsters are missing because you are not running version 1.2 of the normal Amnesia game.