But to use one version for playing MP between several people is a totally different kettle of fish.
Every other game I've bought on GOG allows that.
Divinity Original Sin, Starbound, Baldur's Gate 2: EE, etc.
Again, it's not unreasonable, and very much how GOG works.
It's sounding like this is no longer a help thread, as I've found that playing Multiplayer over LAN is not Possible. I'll be refunding this game, which sucks because it looks wonderful. Maybe if LAN play is added in the future, I'll re-evaluate this game, but currently it makes no sense buying a Multiplayer focused game where LAN functionality isn't even there.
Thanks for your comments, guys. I appreciate your insight.