Redownload and reinstall the mod. For some people Caroline's in-game walkthrough would get stuck at that part but I fixed it.No using it on my laptop. The mod works for the neighbor scenes just not the teacher and older sister. It tells me to go to the sisters room at night but nothing happens, and it tells me to go to teachers office in the morning and nothing is happening
The thing with Celia not being in the teachers' office isn't related to the mod though and was a bug that could happen in the 0.6 beta. Someone in this thread found a way to fix it with the console but you'd have to find his post.