"Purchase" (download) YouTube there so it is linked to your account.
If you have previously downloaded YouTube using your Apple ID, you may be able to install an older, compatible version: Open the on your device. Tap on your Profile icon (or "Purchased" tab) . install youtube ios 1257
However, you can still install a compatible older version using the methods below. Method 1: The "Purchased" List (Best for existing users) "Purchase" (download) YouTube there so it is linked
Apple has a hidden feature: If you previously downloaded YouTube version 1257 on your Apple ID, you can re-download it even if the App Store now shows a newer version. install youtube ios 1257