That's weird.
Everything that's required to use Logic is part of the Logic main installer, so you shouldn't have to be installing this by itself. Did you run the main Logic installation and still have this problem? Just wondering why you need to install this piece without doing it via Logic's installer!
However, I think that you can use something called Pacifist (.. Pacify... or something like that) and it allows individual pieces of an installation to be installed without going thru the main installer (Logic's disc 1 in this case).