Right-click the “Volume” icon on the Windows taskbar, select “Sounds” and choose the “Playback” tab. Click the “Digital Output Device (HDMI)” option and click “Apply” to turn on the audio and video functions for the HDMI port.
The usual suggestion is to delete the app; then go to home>settings>system>power to do a "restart." (If the "fast start" option is enabled, I would disable that. It keeps things in memory, never reloading fresh copies. Things go bad, and stay bad.). Then install the app. If that doesn't work, then people are told to contact the app's support.
If your Sharp Roku TV remote is not working and you can’t access your TV’s menus to perform the update, then use the Roku App. To update your Sharp Roku TV: Press Home on your remote. Then Settings in the on-screen menu. Use the Right Arrow and choose System. Right Arrow to System Update. Then Check Now to run the update process.
MF9S.