You might want to change the name of the "Installation" forum to something like "Installing the Game".
I found out about Aurora from a thread on 4x games at the wargamer.com site. That thread gave instructions on how to install Version 4.75. When I got here, I found the files in the Downloads section and at the Wiki site. Both places allow one to install 4.75, but leave one confused as to how to patch. Unfortunately, for you, Installation happens to be a label for a game concept. There is a thread on "Installations" in the "Academy" forum.
I hope this explains why some people may be confused.