How to download and install a zip file add-on or repo
Click on the zip file / it will download to your system or where you set it to download usb or memory card or on the PC
On xbmc / click system / click add-ons / click install from zip file / then locate the zip file / click on it or highlight it then click ok / done
if it is a repo / click get add-ons / find the repo you have just installed and click on it, you will need to click on video add-ons if it is a video add on or you will need to click on music add-ons if it is a music add on.
Find the add-on you want and click on it and click install