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I want to add Amazon app to my Apple TV?
If you're referring to Amazon Instant Video, it isn't available for any version of AppleTV. If you have an iOS device that supports AirPlay you can load the Instant Video app onto it and AirPlay content to your AppleTV. I do it all of the time and it works great. The same thing can also be accomplished using an AirPlay compatible Mac and the Amazon Instant Video site.