Lycanthropos

My version is 4.09.00.0904. So I don't understand what's going on

I have downloaded Stardock Central 2.30. I've purchased GalCiv2 on-line. I've followed all the steps the mail showed me... But when I press the Install buton it says "Galactic Civilizations II requires Direct X 4.09.00.0903 or later to run. Please download the latest Direct X from..." I have installed 9.03 c just a week before in one of my latest brought games. Do you have any idea about what can I do to install my rightfully brought game? Thanks