I believe I may have already responded to your query via the Steam ‘Bug Reports’ Discussions, but I’ll paste my response in here in case you haven’t already seen it:
We’re attempting to narrow down the causes of the COULDNT_RESOLVE_HOST error.
In the mean time, the solutions listed here may help you.
Admittedly the COULDNT_RESOLVE_HOST error is a complicated one and we’ve yet to uncover any reliable solutions. Sorry we can’t be of more help right now.
I don’t know if this will help you, but perhaps it will be useful data for the team
When I switched to modded realm at a suggestion for a friend(at me wanting to say no because it wasn’t logical that it would fix it), please note I have zero mods of any kind, to my disbelief I could suddenly play the game.
I have same problem I just bought the game and and I cant play it … 58 gigas for nothing im really pissed ill ask a refund if it hasn’t been fixed tomorrow