After windows updates completed one of our machine.
If product is already installed on the machine then we are showing the message as "Product already installed" but windows updates not showing any messages.
Setup started directly.
appears only when two products have the same ProductCode. Maybe you have increased the version from your second setup and you have also changed its ProductCode, thus the message will no longer be spawned.Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Programs and Features in the Control Panel.