How to Setup IPTV on Fire TV Stick
1: From your device's home screen, hover over the Search option.
2: Click on Search.
3: Search and select Downloader.
4: Choose the Downloader app.
5: Click on Download.
6: Once the installation is complete, click Open.
7: Return to the Home screen and open Settings.
8: Click on My Fire TV.
9: Choose developer options.
10: Click on Install unknown apps.
11: Search for the Downloader app and click on it.
12: This action will enable unknown sources for Downloader application.