[2019] Got the game yesteday and I can't even play it

Sorry to hear this Nocturne.

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.