Official Put.io TV App
You can side-load our TV app very easily to your device by following these steps:
Download The Web App Tester
The Web App Tester is available for download from the Amazon Appstore. You can install the Web App Tester from the Amazon Appstore on your device, or get it from the Amazon website.
Open The Web App Tester and Create a New Hosted App
You can use putio as app name and you should use tv.put.io as app url. After you fill the fields, press Add to Device button.
Launch the App
Just press the TEST button and you’re all set!
Put.io Android App
Steven Schoen, the author of the unofficial put.io Android app, is trying to make the app available on the Amazon Appstore so try searching there first.
If that fails, you can follow the instructions from Orçun’s post to side-load that Android app on Amazon Fire TV.