You are working with a legacy device for a specific purpose (retro gaming, development, or media player) and you download exclusively from verified sources like APKMirror.
For Android 5.1.1, the specific version of the launcher was typically part of the Nature UX 4.0 Zero/Noble UX Target Devices : Primarily the Galaxy S5 Neo (2015), and older flagships like the that received the 5.1.1 update Official APK ID com.sec.android.app.launcher Legacy Status samsung touchwiz home lollipop 5.1 1 download