title: How to upgrade via msi
body: <p>I want to upgrade my product via msi setup. 
  The Upgrade Code of both msi remains the same because it's the same product family. Even if I change Version/Product Code of the msi for updating it just tells me the product is already installed or asks me to repair it. it doesn't ever provide an update option that replaces the current installation.</p>
  
  <p>I'm using Visual Studio 2008 Pro to generate the msi setup</p>