Follow this
There are two ways you can access the ZIP.
1. You can download it to your PC (which you've already done), so the next thing would be to set up a shared folder on your PC with that zip file in that shared folder then you can browse for it from Kodi after you choose install addon from zip, navigate to Windows Network
or
2. Watch and follow the steps to add https://github.com/Swedemon/xbmc-ball-streams/tree/master/downloads as a source. Then proceed to Install addon from zip and navigate to the source you just added. It will be a pain to type that whole address in using the remote tho.
Weird because when i type my password to my cpu network it doesn't work. I think i'll just keep my roku and amazon stick hooked to the TV and switch back and forth and keep Kodi just for movies....this is a pain in the arse lol