Even as a legacy version, 13.42.6 includes the core features that made YouTube the king of video:
Since this version is no longer available on the official Apple App Store, you must "side-load" the IPA file. Here are the two most reliable methods: Method 1: Using AltStore (No Jailbreak Required) Youtube 13.42.6 Ipa Download
If your device is on a vulnerable iOS version, TrollStore allows permanent, non-expiring installs without resigning. Even as a legacy version, 13
If you do go the IPA route, only download from well-known communities, scan every file, and never enter your Apple ID password into a third-party tool without understanding what it does. Even as a legacy version