You generated a GOG claim code from the backer portal and redeemed it on GOG, correct?
I have the same problem. Redeemed my Fig Version, redeemed the DLC Content. No Download for the FIG-Version and the DLC-Content says i must buy the game because i dont have it.
I can see the FIG- Version it in my GOG library
http://www.imagebam.com/image/e53221852432164
http://www.imagebam.com/image/4a6401852432194
http://www.imagebam.com/image/54750b852432224