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copied!<hr> <p><strong>IMPORTANT</strong>: <em>It's been a while since this answer was originally posted, and smart people came up with wiser answers. Check <a href="https://stackoverflow.com/questions/46637094/how-can-i-find-the-upgrade-code-for-an-installed-msi-file/46637095#46637095">How can I find the Upgrade Code for an installed MSI file?</a> from @ Stein Åsmul if you need a solid and comprehensive approach.</em></p> <hr> <p>Here's another way (you don't need any tools):</p> <ul> <li>open system registry and search for <code>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall</code> key (if it's a 32-bit installer on a 64-bit machine, it might be under <code>HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall</code> instead).</li> <li>the GUIDs listed under that key are the products installed on this machine</li> <li>find the one you're talking about - just step one by one until you see its name on the right pane</li> </ul> <p>This GUID you stopped on is the ProductCode.</p> <p>Now, if you're sure that reinstallation of this application will go fine, you can run the following command line:</p> <blockquote> <p>msiexec /i {PRODUCT-CODE-GUID-HERE} REINSTALL=ALL REINSTALLMODE=omus /l*v log.txt</p> </blockquote> <p>This will "repair" your application. Now look at the log file and search for "UpgradeCode". This value is dumped there.</p> <p>NOTE: you should only do this if you are sure that reinstall flow is implemented correctly and this won't break your installed application. </p>

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