Open the project file (.ISM or .ISPROJ). Navigate to General Information. The Product Code is displayed in clear text.
Result: Windows sees the same Product Code and attempts a "repair" instead of an upgrade. Your new files may not install. Fix: Always enforce a checklist: Major version bump = New Product Code. installshield product code
Result: You write a custom action that checks for OLD-GUID. When you change the Product Code, your script breaks.
Fix: Use property references (e.g., [ProductCode]) in InstallScript or use the MSI API to retrieve the current product code dynamically. Open the project file (
In the world of Windows software deployment, few identifiers are as critical—or as frequently misunderstood—as the InstallShield Product Code. Whether you are a seasoned setup developer or a beginner packaging your first application, understanding the Product Code is not just a technical necessity; it is the foundation of reliable installations, seamless upgrades, and clean uninstalls. Result: Windows sees the same Product Code and
Many developers treat the Product Code as just another GUID (Globally Unique Identifier) generated by a wizard. However, getting it wrong can lead to "side-by-side" installation disasters, orphaned registry entries, or the dreaded error: "Another version of this product is already installed."
This article dives deep into the anatomy of the InstallShield Product Code, how it interacts with Windows Installer (MSI), best practices for major vs. minor upgrades, and how to manage patches without losing your sanity.
If you inherit an old project or need to troubleshoot a client's machine, here is how to find the Product Code of an installed application.