If you are searching for this, be very careful of download sites promising a working version. Most are traps. Your best bet for actually finding a working file would be archived subreddits like r/sideloaded or specific iOS tweaking archives, but expect the apps to be buggy or unable to log in due to server-side changes by YouTube.
If you want legal alternatives, I can help with: youtube ipa download ios 12 patched
The official YouTube app on iOS devices comes with limitations, such as ads, no background playback, and restricted video downloading. However, by downloading the YouTube IPA file on your iOS 12 patched device, you can enjoy a range of benefits, including: If you are searching for this, be very
Avoid IPAs that ask for your Google password outside of the standard OAuth popup. If you want legal alternatives, I can help
Often including features like ad-blocking and background play.
A popular tool where you connect your iPhone to a computer, drag the IPA into the tool, enter your Apple ID, and it installs the app to your device.
A patched YouTube IPA file specifically tagged for iOS 12 compatibility.