Instead of fighting with an 11-year-old app, consider these modern alternatives for old phones:
On the YouTube download page, look for a button labeled "Versions" or "Older versions." youtube old version 5.1 1 download uptodown
If you are reviving an old device (like a Galaxy S3 or an original Kindle Fire), the Google Play Store may no longer support your OS. Manual APK installation is often the only way to get YouTube running. How to Download from Uptodown Instead of fighting with an 11-year-old app, consider
Go to your device Settings > Security (or Applications) and toggle on "Unknown Sources." This allows the installation of apps from outside the Play Store. youtube old version 5.1 1 download uptodown