When you open it up you will see there are actually three campaigns. The Spitfire and Hurricane ones go in campaigns GB and the Kanalkampf one goes in campaigns DE.
OK, I have a legitimate problem I think. I can copy files back and forth pretty proficiently, or have been able in the past. But I gotta ask - what in the world is peculiar about copying any or all of these three to their "proper" place? Unzipped, copied the two Kenley folders into GB campaign folder (in BAT of course). In Explorer, files show up where they should. But when I start the game, go to campaign loading screen, New, then to RAF, they are not there. Where do you reckon they went? What have I missed? They aren't single missions are they? Man, this is just confusing the heck out of me. I don't know how I would do it differently. And just for curiosity sake, I copied one of them into my backup of CUP. Magically, it was where it should have been and appeared like it was supposed to. But when started it crashed and burned immediately. But I just wanted to see if my "copying ability" had deserted me. Any advice you can share would be greatly appreciated. I am sure I am doing something incorrectly.