Our position on refunds is pretty simple.  We think of our digital content like a song downloaded on i-tunes, or a book downloaded for your Kindle.  Since this is digital content there is no way for it to be returned.  We try to clearly communicate this in our terms with the following:

All Sales Final; Downloading and Risk of Loss; Availability of Digital Content. All sales of Digital Content are final. We do not accept returns of Digital Content. Once you have purchased Digital Content, we encourage you to download it promptly and to make back-up copies of it. If you are unable to complete a download after having reviewed our online help resources, please contact support. You bear all risk of loss after purchase and for any loss of Digital Content you have downloaded, including any loss due to a computer or hard drive crash. We may, from time to time, remove Digital Content from the Service without notice.

If there is some other reason that you may feel you are entitled to a refund please contact us.