Typically your Sling TV app will automatically update on your Roku device. If an update does not automatically occur follow the steps below to check for and install any available updates.
Start by returning to your Roku home screen.
Next, select System Update.
Click Check Now.
Your Roku device will scan for any available updates across all applications.
If an updates is available, your Roku device will automatically install the update. Once the update is complete click OK.
Use the Home button on your remote to return to your home screen. Then, launch your Sling TV app and begin streaming.