Honestly, I think it's going to be nearly impossible for me to fix Dungeon at this point. It's weird though, there's several Dungeon adventures on Loadstar issues. Obviously at the time people didn't have this trouble using it. It makes me wonder if the version on Loadstar Compleat isn't broken, it does use the problematic REL files.
The version on Loadstar Compleat is mostly the same as this anyway.