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The game originally had LAN multi-player, what is the reason it was disabled?
I don't have the answer...

... but...

... I do wonder if this was a publisher demand for it coming to GOG DRM-free (in essence, "gimp" the DRM-free version to make it slightly less desirable).
There is a small thread in the Dungeon Siege forum about multiplayer

https://www.gog.com/forum/dungeon_siege_series/onlinecoop_play

doesn't address LAN but it is a start.
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wolfsite: There is a small thread in the Dungeon Siege forum about multiplayer

https://www.gog.com/forum/dungeon_siege_series/onlinecoop_play

doesn't address LAN but it is a start.
Thanks, testing it now