If the book doesn't earn its keep, you shouldn't pay for it. Write to help@callowayruth.com within 30 days of your purchase, from the email you bought with, and we'll refund you in full. No forms and no questions, and you're welcome to keep the files.
Refunds go back to the card or PayPal account you paid with and usually show up within 5-10 business days, depending on your bank.