Even if you install an old IPA, YouTube may show an "Update Required" message that prevents video playback. You can bypass this by spoofing your app version:

If you want, I can:

Installing YouTube on iOS 7.1.2 in 2026 is challenging because the official App Store no longer supports this version for the standard YouTube app

How to Get YouTube Working Again on iOS 7.1.2 (IPA Download & Installation Guide)

Before downloading and installing IPA files, make sure to take the following precautions:

A prompt will appear: "Do you want to download the last compatible version?" Tap . Fixing "Update Required" Errors (Jailbreak Required)