You install Plex Media Server on a computer or NAS device where your media is stored. You don’t install it on the TV. The TV app just gives you access to the server. If you are trying to access the free Plex provided content, that’s not available from that Plex app. It’s an old app that doesn’t support these new features. There is a newer beta app available, but I believe you have to opt in. See Try out our new Vizio SmartCast preview for more details.
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