You may encounter problems with authorization, which will result in an error that says one of the following:

• “E_ACT_NOT_READY”
• “E_AUTH_NOT_READY”
• “E_ADEPT_INTERNAL”
• “E_AUTH_BAD_DEVICE_KEY”
• “E_CHECK_ACTIVATION” or “ERROR! CHECK ACTIVATION”

You may need to deauthorize and reauthorize Adobe Digital Editions.

1. Open Adobe Digital Editions. If you have a book open, be sure to exit the book and go to your Bookshelf Library.
2. Deauthorize Adobe Digital Editions by navigating to “Help > Erase Authorization,” or press the following on your keyboard: CTRL+SHIFT+D (on Windows).
3. If prompted for your Adobe ID password, enter it and hit “Continue.” Click “Erase Authorization” on the window that appears, then click OK.
4. After your authorization is removed, please try to download your book again.
5. If you have previously downloaded your book to another computer, please use the same Adobe ID when authorizing subsequent devices.