Navigate to the directory where GT Works3 is installed (usually C:\Program Files (x86)\MELSOFT ). Look for a utility named or similar.
Look for an option labeled or "License." Re-enter your 10-digit or 12-digit Product ID. 3. Check the "GT Designer3 Management" Tool
This tool can sometimes repair the link between the software and the registered license key. 4. The "Clean Reinstall" Method
You may be trying to run a specific version of GT Designer (e.g., GT Designer2 vs. GT Designer3) that isn't covered by your current Product ID. Step-by-Step Solutions 1. Run as Administrator
Mitsubishi often includes a management tool within the installation folder.
Ensure you are using the latest version of the MELSOFT Update Manager . Sometimes a Windows update breaks the license service, and a software patch from Mitsubishi is required to fix it.
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