"As with most software products, we do not offer refunds or exchanges for purchases made on our website or through the Steam Client. This includes, but is not limited to, games, Early Access Games, software, gifted or traded purchases, downloadable content, subscriptions, and in-game items/currency.
We will make an exception and refund titles that are still listed as available for Pre-Purchase on our website. The refund request must be received prior to the official release date for the item. You can see when a pre-purchased title is scheduled to officially unlock by viewing the green information bar on its store page. "