Finding, Installing and Playing a Custom Level

If you are stuck in a custom level, you may ask your questions here.

But please keep in mind, I have not played every custom level, and currently there aren't much custom level players here.

To get a quicker answer, please post screenshots or even a savegame.

I offer a Walkthough for:

Tomb of the Vikings by Jan Beinersdorf(written by him)
Sanctuary of Water, Ice and Fire by Rene Brooymans (Piega) (written by me)