From this detailed guide, you can learn how to install Free99 Addon On Your Kodi.
Diggz Free99 is a Good Non Debrid Kodi Addon and a fork of the Scrubs v2 addon. Sections include Movies, TV Shows, New Movies, Search and more.
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 Free99 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://tinyurl.com/diggz123
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click DIGGZ
- Click repository.diggz-x.x.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click Diggz Repository
- Click Video Add-Ons
- Click Free99
- 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.