From this detailed guide, you can learn how to install The Chains Addon On Your Kodi.
The Chains Kodi Addon is an extensive all-in-one addon for your media center. The available sections include Search, Trakt, IMDB, One Click Media and many more.
The addon has separate categories for specific genres such as sci-fi or retro. The Chains supports premium services like Real Debrid but also comes with 1-click playlist style content. The addon is located in The Chains Repository.
this installation guide applies to all compatible devices including Amazon Firestick, Fire TV, Android & iOS, Mac, Windows, Android TV, Android Boxes, etc
How To Install The Chains 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://unhingedthemes.github.io
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click CHAINS
- Click repository.chainsrepo.x.x.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click Chains Repository
- Click Video Add-Ons
- Click The Chains
- 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.