I need your help ASAP. We have an application that we package via Installshiel Express 2009. When we do a major new release of our software, I generate the new guid for Product Code and leave the Upgrade Code as is. I leave the product name the same and increment the product version by 1.
After I build the release and install, it will create a new entry in Add/Remove programs in Windows Vista instead of automatically uninstalling the old version and installing the new version. I therefore see 2 entries of my App in Windows Add/remove programs.
Is it right that I only generate the guid for Product Code? This was working about a year ago. The only difference is that I reformated my PC and installed Installshield again. I have tried everything, even used Orca to open the MSI to locate the Upgrade Code in the old version and made sure it is the same in the new version of our software..