I have an older Vizio Smart TV. I am trying to add the Amazon Prime app, but cannot find it in the available apps. Is it possible to add this to my Vizio E422VA?
I doubt there will be "Prime" application, you are probably looking for "Amazon Prime Video", to stream video off Amazon.
The Manua[ does not say anything about what apps are available.
I would direct your question to Vizio support. Check whether there's a firmware update, too.