It is common to confuse these two GUIDs, but they serve very different purposes:
The AutoGUID feature ensures that every release of an application maintains a consistent identity for servicing (updates) or correctly generates a new identity for major upgrades, eliminating "duplicate installation" errors and ensuring clean upgrade paths.
You want both versions of the software to run concurrently side-by-side on the same machine. Do NOT Change the Product Code When:
Managing this code is critical for product versioning and updates: installshield product code
If an application is missing files or registry entries, you can force Windows Installer to check the health of the application and repair it using the Product Code: msiexec.exe /fomus 12345678-ABCD-1234-ABCD-123456789ABC Use code with caution. Creating Verbose Logs
Incremental versions (e.g., moving from v1.1 to v1.2) where the product architecture remains largely unchanged.
You fix minor bugs without changing file structures or component layouts. It is common to confuse these two GUIDs,
For minor changes where you want to patch or update an existing installation without a full reinstall, you typically keep the existing Product Code.
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
It tells Windows exactly which program is being installed, repaired, or removed. Creating Verbose Logs Incremental versions (e
InstallShield relies heavily on Product Codes to differentiate between minor upgrades, small updates, and Major Upgrades.
When a user goes to "Add or Remove Programs," Windows looks up the Product Code to find the associated uninstaller. Preventing Duplicates:
This guide breaks down what the Product Code is, why it matters, and how to manage it effectively. What is an InstallShield Product Code?
: If two different installers share the same Product Code, Windows will assume they are the same product, leading to "Another version of this product is already installed" errors. How to Find and Generate Product Codes in InstallShield