If you can’t download or update apps on your iPhone or iPad
Try this if you're experiencing an issue when you update or download apps from the App Store on your iPhone or iPad.
Update the app manually
Add a payment method
You may need to have a valid payment method on file, even if the app you want to download is free.
Resolve a problem with your payment method
Prioritise the download
From the Home screen, touch and hold the app. From the menu that appears, choose Prioritise Download.
Restart your device
Restart your iPhone or iPad, then check if you can download or update apps.