If you have purchased an Add-on and you reinstall the app or install the app on a different device, you will need to restore your purchases. In some cases you will need to restore your In-App purchases after the app was updated to a new version.
👉 To restore your purchases, tap on the menu icon.
👉 Tap on "Add-ons" below
👉 Tap on "Restore purchases"
You may need to enter you password for your Apple ID.