Unlike the Steam version, the GOG versions of the game are not aware of each other. Specifically this means that, while I own all three (Base game, Soul Harvest, Fallen God) on GOG, I can only play the Fallen God races from within the Fallen God client, only the Soul Harvest races from within the Soul Harvest client etc. This is an annoyance for SP, but completly kills MP which you can only join via the Fallen God client - meaning I'm stuck playing a subset of races.
