Why doesn’t Kodi stick on my computer?

Hello,I have a frustrating problem. I downloaded Kodi Jarvis “on top” of my older version but every time I try to open it (when I click on the icon ) it comes up a box that wants to install it. The icon looks different now I think because there is a little shield (I don’t know if that word is right.) I am sure I must have done somehing wrong but I don’t know what! Please help me if you can. I feel kind of desperate. Thanks!

I am new here and English is not my first language so please excuse any spellingmistakes.