“This app requires iOS 14.0 or later.”
: If you haven't "purchased" it before, you can "buy" it (it's free) on a newer iPhone or iPad first, then it will appear in your old device's Purchased list. 2. Sideloading via IPA (Advanced) youtube ipa file for ios 9.3.5
Installing the official YouTube app on (standard for older devices like the iPad 2 or iPhone 4s) is tricky because the App Store often blocks downloads for being incompatible. You can still get it working through a few proven workarounds. Option 1: The "Purchased" Tab Method (No Jailbreak) “This app requires iOS 14