Entertainment Watchers or Sport lovers when install the Kodi for the first time might don’t know that third part addons or repos can only be allowed to continue installation by kodi unless they allow turn on the unknown locations in the Kodi. The option will secure the user from installing any addon which is not secure for the device or use himself but due to excessive amount of addons which were good and better than official ones user all the time turn off the unknown locations.
How to Enable Unknown Sources Installtion in Kodi:
First of all click on setting icon at left upper side of window in kodi home.
Now click on System Setting Option
Hover on Addon menu
From here if Unknown location are off click on the slide button to enable the unknown sources to install Kodi application having unofficial status.