Get Airwave.

On Amazon Fire TV

1. On the home screen, search for Downloader and install it (it's free).
2. Open Settings → My Fire TV → Developer options → Install unknown apps and turn on Downloader. If Developer options is missing, open Settings → My Fire TV → About and press OK on your device name seven times.
3. Open Downloader, type airwavetv.live/apk and choose Go. When the download finishes, choose Install, then Open.

On Android TV and Google TV

1. Install Downloader from the Google Play Store on the TV.
2. Open Settings → Apps → Security & restrictions → Unknown sources and allow Downloader. On Google TV, if that option is missing, first open Settings → System → About and press OK on Android TV OS build seven times.
3. Open Downloader, type airwavetv.live/apk, then install and open Airwave.

Airwave keeps itself up to date: when a new version is out, it offers to install it.

On a phone

Open this page on the phone, tap Download APK, then open the file. Allow your browser to install unknown apps when asked.

Updating from an older build

If installing fails with "App not installed", uninstall the old Airwave app first, then install this one. Your account and playlists stay on the server.