Update to MS Office creates new "Installed product"

Hi

I've made our own "Installed Product" package for MS Office, Visio and Project.

In this example I use Visio 2010.

As you can see I chose ver. 14 ( no buildnumber after) and should be able to see every version 14.xxx in my system.

But when the new build arrived, it created a secondary package. Therefore I need to edit my current package and "Inculde Components Associated with other products"

why is that ?