If YouTube isn't in your history, log in to your Apple ID on a newer device (iOS 14+) and download it there first. It will then appear in your "Purchased" list on the older device.
Locate the strings CFBundleShortVersionString and CFBundleVersion . install youtube ios 1257 exclusive
Even if you install an older version, Google often blocks it with a "Update Required" popup that can't be bypassed. If your device is jailbroken, you can spoof your version number to trick the app. Open (available via Cydia). If YouTube isn't in your history, log in
Method 2: Fix the "Update Required" Error (Jailbreak Required) If YouTube isn't in your history