Before we dive into the download, it is critical to understand the technical landscape.

Searching for "YouTube for iPhone 4 iOS 7.1.2 download upd" will NOT yield an official IPA from Apple or Google. That binary does not exist in their current catalogs.

However, you have three viable paths forward.

| Method | Works Without Jailbreak? | Can Sign In? | Video Quality | Stability | | :--- | :--- | :--- | :--- | :--- | | Last Compatible Version | Yes | No | 360p/480p | High | | Sideload IPA | No (requires PC) | No | 360p | Medium | | Safari Desktop Mode | Yes | Yes (clunky) | 360p | Medium-High |

Recommendation: For 90% of users, Method 1 (Last Compatible Version) plus Method 3 (Safari) for login-required tasks is the ultimate setup.

If you have previously "purchased" (downloaded for free) the YouTube app on a newer device using the same Apple ID, you are in luck. Apple allows you to download the last compatible version for your device.

Step-by-Step Guide:

This will install version 12.41 (or similar) of the YouTube app, which was the last version optimized for iOS 7.