Download a patched YouTube IPA (version 12.x or lower, depending on iOS). Sideloadly to install the IPA on the iOS device.
Trying to run an old, patched YouTube version on your iPhone or iPad? Here’s why sideloading fails, how Apple’s signing works, and the real alternatives for older iOS devices.
The message is clear:
The community relies on specialized repositories and tools to keep the app alive. 1. TubeRepair (Recommended for iOS 4–6) TubeRepair
To understand the "patched" reality, you must first understand the "unpatched" history. Before iOS 14.5 and the modern App Store restrictions, users had three primary methods to install an older YouTube IPA:

