MarketPress: Automatically add an item to cart when another is selected


I am trying to find a way to add an item to the cart automatically when another is added. The case here is that I am offering a software product and want a year of support added automatically. I can isolate the item to add as a single item and it would happen to anything in a certain category if that helps.

Can you guys please involve a developer here to see what we can do? I saw a post on here and the guy had his site automatically adding an item to the cart without user interaction. I tried reaching out but didn't hear back.