To install Player on the Roku set-top box,
1. Sign in the Roku site HERE If you have no account, create a Roku account and then link the Roku set-top box to the created account.
2. If you forgot the email used for signing in, it can be checked via the set-top box. Go to the settings: Settings → System → About.
3. After signing in, follow the link in a web browser: HERE Click Add Channel.
4. Go to Settings → System → System Update on the Roku set-top box and click Check Now. Then Player will be installed on the Roku set-top box.
5. Start Player.