Choose install location

I am installing the east front mod and I do have steam but anyway when I get to the point in the install when i am asked for the destination folder I am not sure where to go. I tried

C:/Program Files/Steam/Steamapps/Common/Company of Heroes

but the install button is not highlighted for this file so I need to browse to find the correct file but I'm not sure where to go. Please advise.

same problem with me
after some search  the only problem was  RelicCo.exe