Why Xnurbs is in this format?

I downloaded Xnurbs from Food4Rhino5 website that was free, but its format is (.rhi) instead of (.rhp).

What is the solution? How can I change .rhi into .rhp format to be usable?

.rhi is an installer, just double click it.

(Or rename it to .zip and open it to extract the content)

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