Samsung have made many Smart TVs over the years. You need to tell us the model number. Or if you can find some sort of app store on your TV, the NowTV will either be available there, or not.
The Now TV app is available in the Samsung app store. I use it on my Samsung smart tv.
"There are not enough superlatives in the English language to describe a 'Princess Coronation' locomotive in full cry. We shall never see their like again". O S Nock
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Is it in the Samsung TV app store?