I used CKan to download the BDArmory mod and the other required mods for it to work, but I can't actually build weapon managers or any weapons. All of the BDA tabs in the construction menus are completely empty, and when I check the R&D building there are no BDA things in the tech tree at all other than a couple of seats.
Any ideas? I also tried installing the mod manually without CKan, and it's the same thing.