The version you're referring to, "YouTube 13.42.6 IPA," suggests you're looking for a specific version of the YouTube app, possibly to access features available in that version or to install it on a device that doesn't support the latest versions of the app through the App Store.
. While it is the most stable version for legacy devices like the iPad Mini 1 or iPhone 4s, it currently requires manual configuration or "spoofing" to function properly because Google has officially discontinued support for this version's API. Download Options Archive.org (Verified Legacy Archive)
Every app version has a "cutoff" point where it no longer supports older operating systems. Version 13.42.6 is that final frontier for devices running .
: There is no support for YouTube Shorts , 4K playback (obviously limited by hardware), or the latest gesture controls.