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It is often confused with the , but they serve different purposes: Change Frequency Product Code Identifies a specific release of a product. Changes with every major version. Upgrade Code Identifies a family of products across all versions. Stays the same throughout the product's life. Package Code Identifies a specific MSI file . Changes every time the installer is built. Administrative Usage

The registry entries mapping the Product Code to the local cached MSI package have been corrupted or deleted by "registry cleaners" or manual tampering.

Changing a Product Code impacts how Windows manages your software ecosystem. Follow these strict deployment rules: Change the Product Code when:

You recompile the installation package without altering features. Troubleshooting Common Product Code Errors

The Product Code acts as the anchor for the entire life of your software on a user's machine.

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InstallShield projects utilize three distinct GUIDs. Mixing them up can break your installation logic. Changing Frequency Changes with every major version release. Identifies a specific product release version. Upgrade Code Never changes across the lifetime of the software.

: Changing version without changing Product Code (or using a proper minor upgrade table) breaks servicing.

Error: "Another version of this product is already installed"

the same. This tells Windows: "This is a new version of the same product; please remove the old GUID and register this new GUID." Managing Product Codes in InstallShield