I'm currently incapable to play with a friend at this game.
When i try to join game i've a message (Connexion to network and/or Galaxy unavailable)

How do you do for playing cooperation in this game ???

Thanks for your answers

What is this suppose to mean ?

I hope this bumps the post because my friend and I are having the same issue. Any fix would be appreciated

Each of you bought your own copy and both are using the exact same game version on the exact same version of GOG Galaxy.

Not sure who you are talking to, but my friend and I both got our copies from GOG. Not too long ago it was offered for free, by GOG, so we both snagged a copy. I will check if we are running the same version of GOG, but I believe we should be.

As it turns out, my friend was running an older version of GOG Galaxy. He'll be installing the latest version, and then we'll test the game, to see if we still run into this problem