Everyone's seen the Starblazer. One can spot it flying past the camera on several landing pads across Sirius. The ship was obviously meant to be purchasable, but was either discarded or forgotten. Evidence of its unfinished implementation is seen in the fact that all of its files were included with the game, it just never made it to the showroom. But now it's up for sale, and ready to be flown. Unlike other mods that add the Starblazer, this one's sole purpose is to give the player the option to buy the ship without adding anything else.
Simply download the folder, which contains the files, and follow the instructions stated in the ReadMe.