Photoshop CS 3 camera raw update

Using CS6.  But after devativating my old CS3 and reinstall it on another computor, cannot get any update.  I understand there will be no updates for older versions of Photoshop, but how can I get back the last version of Camera Raw that was available to CS 3.  The Camera Raw version is 4.0, and before uninstalling it was a much higher version.   Thanks!