I installed the editor.exe exactly where the readme distinguished, but after not getting it able to work; I finally contact EA, who said.
"We are sorry, but you must understand that we cannot solve this problem, as EA does not support all of its products which were developed under external developers"
I'm not sure they knew what 'Dungeon Keeper' actually was, to be honest.
You could try that, if it has been setup for KeeperFX then perhaps it might work.If you want, I have made an editor folder specially for KeeperFX where all I have to do is move the levels from the Levels folder of KeeperFX to the Levels folder of the editor, bring the modifications I want, then return the edited levels to the Levels folder of KeeperFX. I simply use the files required for the editor to work. Anyone interested?