Since YouTube for Android version 5.1.1 is significantly outdated (released around 2012–2013), a standard "current status" report is not applicable. Instead, this report analyzes the application in the context of its historical significance, feature set compared to the modern era, and current usability.
If this works, stop here. You are done. If the Play Store still refuses, move to Part 3. app youtube android 5.1.1