Hey, there are couple of ways to download as well as installing Kodi on Firestick. I am not sure which method you used to download Kodi. I would suggest you download Kodi using ES File Explorer and then it will show install button as soon as download completes.
You can also check this guide -
https://www.firesticktricks.com/install-kodi-on-fire-stick.html
If any further issues, please let me know.
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