Please do check your Firmware version before you activate Pluto TV on your Roku device. You can only install the Roku based TV on your Roku 3, Roku 4 or Roku streaming stick. Check for more information about Pluto TV activate.
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Anirudh here, a student my profession and a Technology enthusiast by passion
I wanted to download the Pluto TV app to my Fire TV stick but it is not available from the app store. Instead the app store search gives Bonko TV which is useless in comparison.
I'm based in the UK so wonder if that is the reason although I cannot see why it should make any difference.
Looking on the PLutoTV home page - it says it is available for the US FireTV, and it is shown in the amazon.com appstore . It does say that it is not for sale to UK - so that might indeed be making the difference for you.
It does also mention an international version but that seems to be only a desktop version - for Windows and Mac.