Refunding DLC :: Help and Tips - Steam Community
https://steamcommunity.com/discussions/forum/1/358415206078118380/
Jun 14, 2016 · (Steam store content usable within another game or software application, "DLC") DLC purchased from the Steam store is refundable within fourteen days of purchase, and if the underlying title has been played for less than two hours since the DLC was purchased, so long as the DLC has not been consumed, modified or transferred.
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