Humm
Well, it should work in both 04 and 06. I do not have 06, so perhaps there is some issue with the CMP, that I've heard so many horror stories about.
To be honest with you, I've never downloaded it because it's obviously already on my machine.
Has anyone else had this problem of it not showing up in Surveyor or Driver?
The only thing I could suggest is to delete any occurences of it - not sure how in 2006, but in 04, I'd use trainzobjects, and delete the route and all related sessions and try to reinstall. Not sure if it will work, but may be a starting point.
Let me know of any progress.
Thanks
n