I had some issues getting the Amazon app store to download the SlingTV app to my Fire TV, but found the direct link to the apk where they stored the files for windows and mac os:
Also, no clue why I'm geographically not allowed to download the apk, from Chicago.
Awesome! I am loading it on my Minix Android TV box now and will report back..
Edit: Works fine!
Thanks for sharing the apk!