Where Name -eq ''` to retrieve the GUID of an installed app.
The Product Code is a unique GUID (e.g., {B7D5B4D8-4B5F-4A8C-9A3E-1E2F7C8B9A0D} ) that identifies a specific version and language of your application in Windows Installer–based setups created with InstallShield. installshield product code
if you want new versions to recognize old ones. Package Code Identifies a specific .msi file . Change for every single build to avoid caching issues. Important Cautions Where Name -eq ''` to retrieve the GUID of an installed app
One of the most critical roles the Product Code plays is in the lifecycle of software updates. It forces developers to make a fundamental architectural decision: is this release a patch or a brand-new version? If a developer changes the Product Code for a new release, Windows treats it as a separate product, allowing both versions to sit side-by-side on the same machine. However, if the developer keeps the Product Code the same but changes the package code, the Windows Installer interprets this as an update or a reinstall. This mechanism prevents the "DLL Hell" of the past, ensuring that essential system files are managed correctly and that users are not left with fragmented, broken installations after an update. Package Code Identifies a specific