Steam keys for non Steam versions or vice versa?

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Accidentally I bought the Steam version of the Inland Shipping DLC.
But I have the non-Steam version of the main game from Gamersgate.
Is there a way to get this version to Steam?
Or to get a key for the non Steam version of the DLC?
Just asking.


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Sorry about the delayed response. I'm sorry to say though that it is as you feared. We sadly can't help with this.