The absolute best, safest, and most permanent way to bypass an iCloud activation lock is through official authentication. It requires no technical knowledge and keeps the iPad fully functional.
Tap the cloud download icon next to the app. iOS will display a prompt stating: "The current version requires iOS 10.0 or later, but you can download the last compatible version." Confirm the download to get the working legacy app version. Utilizing Web-Based Alternatives
Collect your original retail receipt showing the serial number.