Why 4.1.6? Because buried inside its clean, pre-Material Design interface was a backdoor that let you install any app without signature verification. In the wrong hands, it could sideload malware. In Leo’s hands, it was a key to freedom.
It appears there may be a misunderstanding regarding the version number "416" in your search.
Modern Android versions (Android 8.0 Oreo and newer) manage this permission on an app-by-app basis. Open your device .