TV app installation for your Fire TV
Select the appstore via the main menu.
Search for the Sunrise TV App by using voice control.
Select the Sunrise TV App.
Click "Download" to start downloading the app.
Alternatively, you can visit the Amazon website directly:
Search for the Sunrise TV App.
Install it directly on your Fire TV by clicking "Deliver."
Tip: To complete the installation through the Amazon web page, you first need to be logged in with the same Amazon user details as the details you use for your Fire TV account.
You can find further assistance in the Amazon Fire TV Forum.