: This was one of the final versions supporting Android 5.0 before the requirement jumped to Android 8.0+ or 9.0+ for newer builds.
When Google stopped supporting Android 5.1.1 in mid-2021, they did not just remove updates. They also blocked the Play Store from serving the app to Lollipop devices entirely. Users who factory reset an old phone often find they cannot download any version of YouTube from the official store. youtube apk android 511
For Android 5.1.1, you can often find compatible legacy APKs on reputable hosting sites like Version Compatibility : This was one of the final versions supporting Android 5