You can side-load our TV app very easily to your device by downloading APK from https://put.io/dl/putio.tv.apk or 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!