Here’s the step-by-step guide to get the correct version on your device.
If you're having trouble finding the YouTube app or if it's not compatible with your iOS version, you can also try:
Tap Download anyway — the prompt for “last compatible version” should appear. If not, restart your device, then try again from Purchased history.
Stuck on iOS 12.5.7? Here’s the official way to download the latest compatible version of YouTube for your older iPhone or iPad, plus troubleshooting tips.
How to Download YouTube on iOS 12.5.7 (Older Devices: iPhone 5s, 6, iPad Mini 2)