Even if you get the IPA installed, iOS 9.3.5 devices generally have 512MB to 1GB of RAM. Modern YouTube pages load massive JavaScript libraries. The repack will crash to the home screen after 2-3 video loads.
Which of these would you prefer?
If the app opens but shows an error, use Filza to navigate to the YouTube app folder and change the CFBundleShortVersionString to a modern version (e.g., 17.03.2 ). ⚠️ Important Safety & Disclaimer youtube ipa for ios 935 repack