Downloading the official YouTube app on iOS 12.5.7 is challenging because Google currently requires iOS 15 or later
If you have ever downloaded YouTube in the past using your Apple ID, you can often download a compatible older version. on your iOS 12 device. profile icon in the top right corner. (or "My Purchases"). Search for "YouTube" in this list. Cloud download icon download youtube ios 1257 link
Some advanced users use "Jailbreak" tweaks to spoof the app version, but this is not recommended for most users due to security risks. Final Verdict Downloading the official YouTube app on iOS 12
Apple’s ecosystem is designed to prioritize security and the latest software, creating significant hurdles for users seeking specific legacy versions. (or "My Purchases")
If you've never downloaded YouTube on this Apple ID, log in to your account on a newer iPhone or iPad (running iOS 15+) and download it there first. Then, go back to your iOS 12 device, and the app will now appear in your "Purchased" list. 2. The "Update Required" Fix (Web Workaround) YouTube for iOS 12.5.7 Download - Apple Support Community