When the user starts the application or try to restore the purchases, the following error message is displayed: "The operation couldn’t be completed. (SKErrorDomain error 4.), paymentNotAllowed (code=4)".
In order to correct this situation, please do the following:
- Go to Settings > Screen Time;
- Tap Content & Privacy Restrictions. If asked, enter your passcode, then turn on Content & Privacy.
- Tap iTunes & App Store Purchases.
- Tap In-app Purchases and set to Allow.
- Run ABBYY Lingvo app and restore purchases as follows: How to restore dictionaries in ABBYY Lingvo Dictionaries for iOS.