Dead space 2 limited edition now only plays a trial of dead space extraction.

Having brought the dead space 2 limited edition from new when it first came out I downloaded the dead space extraction game on the disc and was able to play the full game as stated on the box.  However I wanted to wait until I had the PS move before I began playing it.  I now have the PS move and so attempted to play dead space extraction.  However after downloading the game again it only offers me a trial version and not the full game.  My question why now do I only have a trial version?  I brought the game from new and could originally play the full version so why the change and what should I do to play the full game?