If you need to restore your device to factory settings then it is possible to restore iTunes guest purchase. To do this:
- Firstly double check that you are logged into the correct iTunes account and you have purchased a magazine under that Apple ID
- In the app go to Account > Restore iTunes Purchases
- Tap Restore
- Once completed, go to Read where you should be able to Download your issues
- If this is not the case, please close the application and open it again to make sure the Read menu reflects the latest information.
Note: Guest Purchases can't be restored to a new device. For non guest purchases simply sign into your account.