Can your play with someone who has the game In GOG if i have the game In Steam?

[eisprinzessin]

Crossplay has been enabled since March, but you might need to look into your configuration:

Grim Dawn - Common Issues and Solutions

Forgotten Gods: Steam/GoG Crossplay

With the release of the Forgotten Gods Expansion (patch v1.1.0.0) Steam/GoG crossplay has been enabled. Servers require additional ports to be forwarded, either by enabling UPnP (automatic) or manually via your router’s port forwarding setup.

When setting up manual port forwarding, the following ports must be forwarded to your servers internal IP address.

42805
42852-42872 (all ports in this range)

If UPnP is enabled in game, these additional ports should be automatically forwarded.

Also all of you need to run the same game version. And if some have more expansions that the other(s), then they need to disable them using the launch options /nogdx2 (for FG) and /nogdx1 (for AoM and FG) - this won’t downgrade chars from FG to AoM respectively from AoM to base game, so these players need dedicated MP chars.