Blue Post
Original thread hosted on Blizzard's official forums.
Recent steam update unable to open game at all
View on Blizzard forums:
https://us.forums.blizzard.com/en/d2r/t/recent-steam-update-unable-to-open-game-at-all/174681/30
We’ve just rolled out a fix for this issue on Steam, you should now be able to jump in game