wise install new product version on an old version

[afz]

Hi

My name is Amit and I'm working a R&D in autofont. I need to make a
setup using the wise installer for windows.
The installation need to be quiet without any UI or messages.
To my understanding if I add the /qn switch I have what I need.

my problem is that if I made a new version of the setup I and install
it a get the the "add/remove program" in the control panel
2 of my application.

What to do.

Thank for help
Amit