Then it is the UK version! Okay. I don't have Ghost Master on my computer and I can't find my previous explanation, so this is going to be tricky but we'll try!
- Go to Start -> Run... - Enter "regedit" (without quotes). - In the registry editor, do a search for "ghostmaster" (again without quotes). - Somewhere, and you may need to browse a bit, you will find a value called "Language" or something. - If you manage to find that value, right-click on it and select "Modify". - Enter "UK" (without quotes) and confirm. - Try installing the Bonus Scenario again.