Reading the thread again it seems you have already discovered the one with the level editor but I wonder if you have discovered the one with DUGA?
Well, if it is true that Pastebin here is at fault then the solution that I would like to propose is to use google drive to share the file instead as Finfee did in their Wiki thread.
From your response in that thread, it seems that this method does work. Let me try posting my new levels in the Custom Levels thread.