When you wonder whether a discount (or a coupon) will work, you can always put the item(s) in your shopping cart and see what happens.
In this case, the discount is working (which I really was not expecting as the conditions of the discount state "Not good with the following promotional offers: Sam & Max: The Devil’s Playhouse, Sam & Max: The Complete Collection and The Great Adventure Bundle.") and brings the upgrade down to $13.46.
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In this case, the discount is working (which I really was not expecting as the conditions of the discount state "Not good with the following promotional offers: Sam & Max: The Devil’s Playhouse, Sam & Max: The Complete Collection and The Great Adventure Bundle.") and brings the upgrade down to $13.46.