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If your device is jailbroken (which is highly recommended for iOS 10.3.4 longevity via tools like h3lix ): Open and install Filza File Manager .
Search specifically for YouTube iOS 10.3.4 IPA or YouTube version 14.02 IPA . install download youtube ipa file for ios 1034
If your device is not jailbroken, you can use to install an older YouTube IPA. If your device is jailbroken (which is highly