I haven't been able to get the original editor to work with GoGs dungeon keeper. I've installed KeeperFX and have tried installing it using directions on Keeperklan but unfortunately there appear to be some missing files. I'm unable to download the demo in order to get the necessary files but perhaps there is some fix to this? Appreciate any help in advance.

dongeon keeper fx and the editor is not compatible as of right now. the gog version should be compatible if you place the editor correctly.

But the instructions on KeeperKlan for getting the editor to work should work, and you should be able to download the demo from there also without issues.

So if you want help with that, tell us what's going wrong with either.