Enter the Product ID precisely when prompted. Do not use spaces or hyphens unless specified. 3. Clean the Windows Registry
A common "license not found" or "project cannot open" error occurs when trying to work with GS-series HMIs (like the GS21) without having the specific support package installed.
The "GT Designer license not found" error is a significant blocker, but as this guide has shown, it is rarely a mystery. By systematically checking the points outlined above—from verifying the installation of the System Driver to addressing software conflicts with antivirus programs and resolving hardware changes—you can diagnose and resolve the issue. For persistent problems, especially those involving version conflicts or add-on licenses, your most effective resource is the official Mitsubishi Electric support network. Your local sales office or distributor has access to the latest technical bulletins, software updates, and troubleshooting procedures required to get your HMI development back on track. gt designer license not found
[Registry Setup Validation Path] HKEY_LOCAL_MACHINE ➔ SOFTWARE ➔ WOW6432Node ➔ MITSUBISHI ➔ MELSOFT Step 3: Resolve Antivirus and Filter Driver Blocker Bugs
Antivirus software (especially McAfee, Norton, or Windows Defender) frequently quarantines Mitsubishi license files because they act as kernel-level drivers. A Windows update or disk cleanup can also inadvertently delete the license file stored in C:\ProgramData\MELSOFT . Enter the Product ID precisely when prompted
. Below is a comprehensive guide to understanding and resolving this issue. vMix Forums Understanding the Error
You are attempting to use an outdated trial version, or the installed license version does not match the software version (e.g., trying to use a GT Works2 license for GT Works3). Clean the Windows Registry A common "license not
Or:
HKEY_LOCAL_MACHINE\SOFTWARE\Mitsubishi\GT Designer3\License
Many license errors are caused by version mismatches. Visit the Mitsubishi FA Global Website to download the latest updates or patches for GT Designer3.