I found a way to fix it (crashes on day 3).
Open Paragon in the map editor; Go to the underworld; Imaginarium Tower (top left corner, on the island); Right-click - properties; In the "Guest Hero" box, click edit; The character with the parameters specified by the author is ORIN - change it to another character (e.g., TYRIS); OK; OK; Save the file.
I have no idea what the reason is, perhaps with this manipulation, the character ORIN (that is, the one you chose) will not be able to do something on the map, because the object will be available only for the character ORIN. If you wish, you can check all possible places where he can go (if there are any) and redo them for the character you made ORIN. But, nevertheless, everything works.