SBCG4AP upgrade problem

I got dangeresque 3 for PC and I want to upgrade but when I put the number in (yes I am putting in the right one) it says "This order doesn't contain a qualifying product to upgrade. Please make sure you're entering the correct order number, and that this product has not already been upgraded. If you need help, please email support@telltalegames.com." So can someone help me?

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