OTA update system

Hi,
I am working on an over the air update system for the windows version of our app, built in Unity. Basically we want an android like functionality in which the user is asked to update the application in case a newer version exists from within the app itself.

I am wondering about how it could be made to work. I am thinking maybe I could download the latest installer (a .msi file). and trigger it from within the app. But this does not sound right, because I would be able to launch any installer from within my app. Is there a standard way in which apps are updated from within the app itself on windows ?
Thanks