How to Install Downloader App on Firestick/Fire TV, Android Devices, Chromecast, and More. Downloader app is used by millions of cord-cutters around the world to sideload apps onto their streaming devices with the click of a button. Downloader can be installed on nearly any streaming device imaginable. This includes any device running the Android operating system (OS). Variants of the Android OS include Android TV, Fire OS, Stock Android, Google TV, and more.