From this detailed guide, you can learn how to install RDFlix Addon On Your Kodi.
This add-on has sections For Live TV, Movies, TV Shows, Sports, Continue Watching, For You, Surprise Me, Trakt Watchlist, Search, LordPlayer, and more.
this installation guide applies to all compatible devices including Amazon Firestick, Fire TV, Android & iOS, Mac, Windows, Android TV, Android Boxes, etc
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How To Install RDFlix Kodi Addon
- Open Kodi
- Be sure to have the Unknown Source box checked as Kodi requires this before installing 3rd party add-ons.
- HOME Screen > Add-ons > Settings button 
> Add-ons > Enable Unknown Sources.
- From your Home Click Settings (cog icon top left)
- Click File Manager
- Click None
-Type in the following EXACTLY
https://mozzy616.github.io/opencode-repo
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click opencode-repo
- Click repository.opencode.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click OpenCode Repository
- Click Video Add-Ons
- Click RDFlix
- Click Install
- Wait till you can see the message Add-on installed pops up. That's it! You can now find you addon from main menu > Add-ons, enjoy.