User blog comment:TerrariamcSwaggins/Hey guys, I'm back with another poll - Favorite Passive Creature?/@comment-24132887-20140301063954/@comment-10343067-20140301111129

Steam automatically updates every legal copy of Terraria (current version 1.2.3.1). So you eihter have a pirate copy, or there really is some mad australian law that prohibits bying Terraria,

Or then you have console or mobile version. Too bad for you, since Terraria is best when played on PC. (I think that console version is more like bad mod for 1.1 Terraria).