Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
Not only is it unneeded, but there's no way you can install one. The Roku OS is based on Linux, but highly modified and there is no way for any software to be installed that could be malicious. Even the few Roku devices that have USB ports have any way to install software from them.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.