If you can't update an app, completely uninstall it. Then, follow the steps below to reinstall the app:
Step 1: Sign out of your iTunes and Apple Store accounts without logging out of your iCloud account.
Step 2: Access the App Store once again.
Step 3: Search for the apps that previously failed to download or update.
Step 4: Tap on the cloud icon and begin re-downloading it.
Step 5: Select “Use Existing Apple ID.” and proceed to log in again.
Step 6: The app download will commence, and there should be no more errors.
Note: This is just a temporary workaround and not a permanent solution.
Thus, we've guided you through a temporary fix for app download and update errors when using Family Sharing on iOS 8. Visit Mytour.vn regularly for more handy tips and tricks.
https://Mytour.vn/fix-app-download-update-errors-family-sharing-ios-8-1456n.aspx
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