Simple video streaming and search functionality.

He hit "Enter." The screen of his modern laptop filled with the directory of a forgotten server. There it was: YouTube_1.2.1.ipa .

The is a legacy application archive designed for older iOS devices. Originally released in the early 2010s, this specific version is often sought by enthusiasts using "vintage" hardware (like the iPhone 3GS or 4) who want to experience the original, simplified YouTube interface or maintain functionality on devices that no longer support the modern App Store version. Overview & Compatibility

Are you trying to get this running on a like an iPhone 3GS or iPad 1?