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Looking for iBooks for iOS?
For iBooks, make sure you have the following:
Mac OS X
iBooks is included with OS X v10.9 or higher. Visit OS X Support to learn how to get the latest Mac OS X software.
An Apple ID is required to purchase and download content from the iBooks Store. For more information and resources, visit Apple ID Support.
Learn more about iCloud, which stores your content and wirelessly pushes it to all your devices.
Support Communities - iBooks
Discuss this topic with fellow iBooks users.
Purchase or Billing Questions? Go to iTunes Store Support
Support for purchase, billing, or account questions related to the iBooks Store, App Store, and iTunes Store is available on the iTunes Support page.