Since this product is purchased through the Apple iTunes store, the return must be requested from iTunes support. To contact Apple iTunes support, please click here.
Here is the onOne Software return policy:
Products purchased directly from onOne software, including electronic downloads and products delivered physically, come with a 30-day money back guarantee. During this period you [...]

To facilitate a product return or refund for a purchase made directly through onOne Software, please contact Customer Service by clicking here. Please provide your original order number and we can provide you instructions for getting the product returned. If you wish to set up the return by phone, please call our toll free number. [...]