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Does Omnissiah come with the LInux downloads, or not?
Base game lists Linux as supported, Omnissiah does not.
Asking since i got a discount code for Omni, but considering GOG sometimes does not feature linux versions for some games etc, i rather ask before i risk it.
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If you mean the DLC that gives you Heretek, Heretek Plus & the "Arc Scourge Weapon".

Then yes the Linux version on GOG does have these available currently.