Windows Defender Firewall often blocks Hamachi traffic. Open Windows Firewall settings, click "Allow an app or feature through Windows Defender Firewall," and ensure both LogMeIn Hamachi and Grim Dawn have both Public and Private checkboxes ticked.
If you tell me you are seeing (like "Unable to connect" or "Room full"), I can give you more targeted troubleshooting steps. grim dawn hamachi full
: Hamachi creates a virtual private network (VPN), making your computers think they are in the same room. Windows Defender Firewall often blocks Hamachi traffic