The YouTube APK version 5.11 has a package name of com.google.android.youtube and a file size of around 37.2 MB.
: Specialized communities provide modified APKs designed for "Android Afterlife" scenarios: youtube apk android 511
If you try to install a newer version of the APK, your phone will either: The YouTube APK version 5
Settings → Security → Unknown Sources (enable for browser/file manager). How to Keep Watching However, do not expect perfection
: Users on version 5.1.1 often encounter a screen stating the app is outdated, but the Play Store offers no further updates. How to Keep Watching
However, do not expect perfection. Over time, Google will change their backend APIs, and eventually, even YouTube 16.x will stop loading videos, showing a "Please update the YouTube app" error. When that day comes, the web app or NewPipe will remain your final lifeline.
For many, the APK route is too cumbersome. The alternative is the browser. Android 5.1.1 supports browsers like Chrome (up to a certain version) or, more reliably, .