Hey Odin, here are a few things you need to download.
Here is the one point three oh patch. You probably already have this, but if you do not, you will need to install it before installing the one point four oh patch. http://www.codemasters.com/downloads/getfile.php?downloadid=1581
Here is the one point four oh patch. ftp://www.flashpoint1985.com/fp/145/OFP_Upgrade_4v146.zip
And lastly, you will need to download this in order to play the map I use the most often (I did not make the map, but I touched it up quite a bit). There are instructions for installation inside the .zip file. It’s also a nice little addon to have. http://www.ofpec.com/publicfiles/addfileaddon//Gimbal_Planes_1.0.zip
Original thread: https://lowcaliber.com/eve/forums/a/tpc/f/7786011002/m/9736055104