Once on the page, enter the promo code into the provided field. Click Redeem.
Enter your first name, last name, and email address on the "Register to Redeem" page. You may check the box provided if you would like to receive email updates. Once you've entered your ijnformation, click Register.
You should receive a confirmation email that provides the link to download your e-book. You'll also see a link to rate and review the title, if you would like to do so.
Once you click on the download link, you will be directed to a page titled “Choose Your E-book Version.” Choose the ePub file.
This will automatically download your new e-book to the Apple Books library on your iPad.