It is not possible to play a LAN game offline ( 2 pc's in the same house with nephew with internet router turned off for the challenged)
It says requires "gog galxaxy" multiplayer DRM ,and coop campaign is greyed out.
please indicate on products web page that this limitation exists aka DRM exists. i know this is not the only product with this kind of limitation.
This is false advertising GOG
Glad i had an opportunity to preview it.

DRM requiremenst - Internet connecion, gog galaxy login ?????????????