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NWN Diamond is available on Linux, it is just not part of GoG installation... as is many other things like the latest 1.69 patch, community patch, A client extender to fix the multiplayer among other things and the ideal game settings. This guide will let you run NWN Diamond on Linux the best possible way:

sinfar.net/getting_started/how_to_play/using_nwn_diamond/linux.
Post edited April 03, 2019 by Mavrixio