From Press Release:
Sharpen your enchanted axe, equip your Boots of Swiftness, and grab that loot – Minecraft Dungeons is available now on Steam!
Players can download the base game ($19.99 USD) or the Ultimate Edition ($39.99 USD), which includes the base game and all six available DLCs: including Jungle Awakens, Creeping Winter, Howling Peaks, Flames of the Nether, Hidden Depths and Echoing Void. The Ultimate Edition on Steam also features bonus content like digital artwork from DLCs and the entire 200+ track game soundtrack.
If you’ve already started your adventure with Minecraft Dungeons on another platform, the Steam version of Minecraft Dungeons supports cloud