How to update apps on a VIA or VIA Plus TV from Vizio:
1. Use your remote to press the V or VIA button.
2. Choose the app you want to update and press the yellow button on your remote
3. If you see Update, click it
4. Select Yes and press OK to confirm your choice
5. Use your remote to get to the App Store
6. Choose the app you want to update or reinstall, and then click OK
7. Choose Install and wait for the process to finish