Repetitive registry entries of software installed by Installshield 2011 Express Edition

I have developed a utility billing software that is being used by many customers.   Every time I make a change, recompile and create a new setup.exe with Installshield 2011 Express, I update the product version and product code. I do not change the upgrade code. This causes repetitive entries in the add/remove programs, which seems to eventually cause problems with the operation of my program.  If I do not change the product code, my program has to be uninstalled before the new release can be installed.  Is there a way to make Installshield go ahead and install the new release over the older release without having to uninstall first, and not create multiple entries in the registry and add/remove program list?
pahokeedave69Asked:
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Vadim RappConnect With a Mentor Commented:
I suggest that you read User Guide, also available at http://tinyurl.com/5u4zwjo, chapter "Packaging Options for Upgrades"; most specifically, "Adding an Upgrade Item" .

Product code, upgrade code, and package code are used by Installer mostly in order to decide when not to install the product, such as because it's already installed. To upgrade, i.e. to remove the previous version, you need to populate the structures directly responsible for the upgrade - which is what "adding an upgrade item" will do.
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