By Br0kenRabbitRipped from the Amazon store/my Cube 2 for u/blackpups.
By Br0kenRabbitThe Roku Channel for Amazon Fire TV devices. This was taken from my Cube 2/Amazon App Store.
USA users can just get it from the app store. Other countries will need to use a USA VPN to access the content.
More info: https://blog.roku.com/amazon-fire-tv
Virus total: https://www.virustotal.com/gui/file/d3e92a11eed88c960f5cc386b5ccc043d559ba7d9b4c039c583ce5a51f2b4f72/detection