This was a well known silver bug that i fixed it by using another player's save files. Anyone has reached the Rain lower part and stucked at the bell part. Appearently David nods when i rang the bell three times but does nothing after the second ring..

Edit: I am terribly sorry that i missed that there is already a topic about it. I am no able to delete this topic so if the moderators delete this topic, it would be most appriciated.
Original topic: http://www.gog.com/en/forum/silver/what_is_the_bell_problem_and_does_the_gog_version_has_it