Cant buy certain DLCs on Turkish Steam
from 
GalCiv3 Forums
GalCiv3 Forums
I cant buy buy the following dlcs on Steam there is no buy option;
Heroes of Star Control: Origins DLC and Viliian version
Lost Treasures DLC
Precursor Worlds DLC
Revenge of the Snathi DLC
I think they are region locked on Steam but I can buy them on Xbox and Epic