If your App runs un multiple devices, you can activate already purchased items like AIP or edition-upgrades on more than one device. To activate purchased items on a second device, please go to menu > settings, scroll all the way down and then Buy Upgrades And Data. Here, please tap on the Restore purchased items -Button.
These things are important for the restore-process to work:
- Make sure your iPad has internet connection and that "Internet Data Link" is switched on in Menu > Settings > Interfaces and Sensors
- You have to be logged on to your device with the same AppleID as on your other device where you have made the purchase, otherwise AppStore will not recognize the previous purchases.