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The native app is dead. Instead:
If you want a native application experience and the standard App Store trick fails, jailbreaking your iPhone 4 opens up legacy app archives. Step-by-Step Instructions youtube for iphone 4 ios 712 download upd
You can use Safari to navigate to alternative privacy-friendly YouTube front-ends like Invidious. These sites strip away heavy modern scripts, allowing the iPhone 4’s single-core processor to load videos much faster. This public link is valid for 7 days
Note: Even if downloaded, older app versions may fail to load content or display an "Update Required" error that cannot be bypassed . Can’t copy the link right now
Before diving into the fixes, it is crucial to understand why you are seeing errors. The iPhone 4 is capped at iOS 7.1.2 and cannot update further. Modern apps like the official YouTube client now require security protocols and software libraries that simply do not exist on iOS 7. Consequently, the App Store will likely tell you the app is "not compatible" or fail to open after installation.
The last build that technically opened on iOS 7.1.2 was (later builds broke the player). You can find these archives on sites like Internet Archive or MTMDev .