If you have previously downloaded YouTube using your Apple ID, you can force the App Store to download the last version that worked with iOS 7: Open the on your iPhone 4. Tap on Purchased (found under the 'Updates' tab). Search for YouTube in your history. Tap the cloud icon to download.
You cannot simply download a working YouTube app from the App Store anymore. But you can build a working solution using web browser tricks or a jailbreak. For most people, adding m.youtube.com to the home screen via Safari is the quickest, safest, and most reliable way to keep watching YouTube on your beloved iPhone 4 running iOS 7.1.2.
Once jailbroken, open Cydia and add the following repositories: youtube for iphone 4 ios 7.1.2 download
Sideloading is more of a nostalgic experiment than a daily driver solution.
If it appears, tap the cloud icon. iOS might offer to "Download an older version of this app". If you have previously downloaded YouTube using your
to download. When prompted with "Download an older version of this app?", select
Getting YouTube to work on an Go to product viewer dialog for this item. Tap the cloud icon to download
Let’s break this down step-by-step so you don’t waste hours.