unfortunately there is no way to register your electronic items purchased from other app stores on your account on O'Reilly.com. If you wish to upgrade to the other formats offered on our site, there should be a link in the front or back of the app with an upgrade link. These items you purchase via the links will appear on your oreilly.com account and will be registered there.
If there is no link in the apps for an upgrade, shoot us an email at email@example.com and one of our customer service reps may be able to work something out for you.
Customer Service Rep,