After replacing the data folder, the game now doesn't even reach the title screen. There are a lot of loading errors concerning the img/system folder, like Balloon.png, Shadow2.png or Weapons2.png. I can't fix them all by myself, and I don't know why the game even tries to load png.-files when most of the files in the img/system folder have the RPGMVP format.
For now, could you please just tell me the password needed to proceed? Unless it doesn't work without properly inspecting the book-related hints, of course.