How use the unlock code?
The unlock code give you access to a discount to the book edition purchase in the application.
To unlock your book edition using the code, you have to use the Unlock content button in the main menu. This button will get you to the activation assistant. Follow the steps in the assistant and confirm your in-app purchase to unlock permanently your book edition.
Once your book edition is unlocked, the unlock code can not be used anymore.
If you have unlocked once your book edition in the application and your content is locked again, follow the recovery procedure explained in the related topic of this help.