If the game is purchased via Steam than I do not think Larian can provide a refund as the publisher (Steam) take their cut and then gives the left over $$ to Larian but do not provide any sort of method to refund/revoke the game.
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I *think* that if you have not downloaded the game there might be some option but again you woudl have to talk with Steam not larian.
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Larian does sell their games via their instore Vault and GOG has a stated refund policy but Steam well that is more difficult as they really hate giving refunds.
