Click Apps, then click OTA. Check your current version. If it is an older version, it should prompt you to download the most recent update. If you are not being prompted an update, you are most likely not connected to the internet. Make sure that you are connected to the internet.
Click Settings, click Apps, click Running, then click All. Scroll down to OmniBox TV Launch. Once you click on OmniBox TV Launch, the software version will be under where it says OmniBox TV Launch (located above Force Stop). Click Clear Cache, and then click Force Stop. You should be prompted to download the most recent version.