The primary issue isn't just the app version; it is the API. Google retired the older Data API v2 years ago, which is what the native iOS 5 "YouTube" app (the one with the television icon) used. Even the later standalone YouTube app released on the App Store for iOS 5 eventually lost support as Google updated its security protocols and video delivery formats to modern standards.
How to Install Any App on iOS 5.1.1 or Older - (ipad First Gen) Youtube Ipa For Ios 5.1.1
Alternative (like Checkmate, Store!) to fix App Store downloads. How to Get YouTube on The First Gen iPad (iOS 5.1.1) The primary issue isn't just the app version; it is the API
Look into the TubeRepair tweak from repositories like cydia.skyglow.es as an alternative to TubeFixer. If you'd like, I can help you with: How to Install Any App on iOS 5
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