Back up your registry by clicking before making changes. Navigate to the following paths: HKEY_CURRENT_USER\Software\MITSUBISHI HKEY_LOCAL_MACHINE\SOFTWARE\MITSUBISHI
Run the original EnvMEL setup file first (found inside the installation package media under the EnvMEL folder). This sets up the environmental variables and shared licensing wizards for Mitsubishi software.
Search for any services related to "Mitsubishi Electric," "MELSOFT," or "FLEXlm" (if applicable). Right-click and select "Restart." 5. Run as Administrator
Locate your official . Ensure it matches the specific version you are installing (e.g., GT Works3 vs. standalone GT Designer3). Run the installer ( setup.exe ) as an administrator. gt designer license not found
| Action | Detail | |--------|--------| | | Provide error screenshot, license type (dongle ID or license number), and software version. | | Reinstall Windows & software | Last resort – sometimes license corruption remains after uninstall. | | Order new license | If physical dongle is dead, you need a replacement (cost involved). |
The error usually appears as a pop-up dialog box with messages like "License key is not installed" or "未检测到合法的license授权" (no valid license detected) upon software startup. In some cases, certain features may operate for about 10 minutes before the software terminates. This error fundamentally means the software's license verification process has failed.
If your company uses a license server:
Once you have resolved the error, take a few proactive steps to prevent it from happening again: Back up your registry by clicking before making changes
Mitsubishi frequently releases updates and "Environment Selection" tools to fix bugs related to Windows updates. Visit the website.
If a reinstallation fails, remnants of old licenses may still be cached in the Windows Registry. Press Windows Key + R , type regedit , and hit .
For official technical support or to verify your license status, you should contact your local Mitsubishi Electric Sales Office or an authorised distribution partner. GT Simulator3 Version1 Operating Manual for GT Works3
Right-click the software and select or Repair (if available). Search for any services related to "Mitsubishi Electric,"
the MELSOFT folders in both Program Files (x86) and ProgramData (note: ProgramData is a hidden folder). Restart your computer.
A recent Windows Update or antivirus scan quarantined or altered critical installation files.
The software may lack the necessary permissions to "read" the license status from the system registry. Step-by-Step Solutions 1. Run as Administrator
Open the Windows and select Programs and Features . Locate GT Designer3 or MELSOFT HMI Works in the list.
