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Took me <10 seconds to find at least a dozen guides on Google.

It's like asking somebody to grab you a beer, when you're sitting in the cooler.

Why do you want to wait for somebody to help you on a barely-related forum, instead of taking a fraction of the time to do the work yourself?

Alright, I'll bite.
It's literally just an installer: you should just be able to run it and go.
Are you updated to the right version of Dark Crusade?
Do you have a bunch of other mods installed?
Have you tried doing a fresh reinstall of the game?