Gt Designer License Not Found ((top)) May 2026

The "License Not Found" error in Mitsubishi Electric GT Designer3 (part of the MELSOFT GT Works3 suite) typically occurs due to issues with the installation of add-on licenses, corrupted configuration files, or improper software updates.  Common Causes of Licensing Errors 

Missing Add-on Licenses: Certain features, such as Enhanced Drive Control (Servo) or Text to Speech, require separate add-on licenses to be registered after the main GT Designer3 installation.

Improper Installation Order: Software may fail to recognize a license if it was installed while other applications were running or if the computer entered a power-saving mode during the process.

Version Incompatibility: If you update to GT Designer3 version 1.265B or later, older uninstallers or installers may fail to recognize the existing installation, leading to potential registry or licensing mismatches.

Corrupted Configuration: Local application data or "trusted storage" files used by the license manager may become corrupted, preventing the software from verifying your Product ID.  Steps to Resolve the Error  1. Register Required Add-on Licenses 

If you are trying to use specialized project data (e.g., GOT2000 enhanced drive control), ensure the specific add-on is installed:  Insert the GT Works3 DVD into your PC.

Navigate to the add-on directory, typically (DVD drive)\Disk2\AddonProject\GTSV.

Run setup.exe and enter the 12-digit Product ID found on your license certificate.  2. Re-verify the Product ID  If the main software itself shows the error: 

Perform a clean re-installation by first removing the software via the Windows Control Panel.

Re-install as an Administrator and ensure all other programs are closed.

Enter the Product ID (3 digits followed by 9 digits) exactly as it appears on your License Certificate.  3. Clear Application Cache  gt designer license not found

For persistent "not found" errors after a successful installation, clearing the application's local configuration can force a reset: 

Navigate to C:\Users\\AppData\Local and ...\Roaming.

Look for folders related to MELSOFT or GT Designer and temporarily move or rename them to see if the software launches correctly upon restart.  4. Check Windows Environmental Settings  GT Works Text to Speech License Registration Instructions

The error "GT Designer License Not Found" typically points to a mismatch between the installed software components and the registered license, or corrupted configuration files

. Below is a comprehensive guide to understanding and resolving this issue. vMix Forums Understanding the Error

GT Designer (including versions GT Designer2 and GT Designer3) is the screen design software for Mitsubishi Electric's GOT (Graphic Operation Terminal) series . This software is usually bundled within the MELSOFT GT Works3 MITSUBISHI ELECTRIC Global website A "License Not Found" error can occur if:

The individual tool (like GT Designer) is launched without the parent suite being properly activated.

Local configuration files that store licensing or environment paths have become corrupted.

The software was installed from a partial update tool rather than the full installation media. vMix Forums Step-by-Step Troubleshooting 1. Clear Corrupted Configuration Files

If the software was working previously and suddenly stopped, corrupted cache or configuration folders are the most likely culprits. Navigate to Local AppData : Open Windows Explorer and go to C:\Users\\AppData\Local C:\Users\\AppData\Roaming Identify GT Folders The "License Not Found" error in Mitsubishi Electric

: Look for folders named "GT Designer," "GT Works," or "GT Title" (common in some software variants). Rename or Delete

: Move these folders to your desktop as a backup, then try relaunching the application. The system will regenerate fresh, uncorrupted files upon startup. vMix Forums 2. Re-register the Product ID If you are using the full MELSOFT GT Works3

suite, the license key is often shared across multiple tools (GT Designer3, GT Simulator3, etc.). Mitsubishi Electric Factory Automation Malaysia Ensure you are entering the Product ID

found on your license certificate or the original DVD-ROM case. MELSOFT Environment Selection

tool (usually found in your Start Menu under Mitsubishi Electric) to ensure the correct software version and license are being prioritized. MITSUBISHI ELECTRIC Global website 3. Verify Installation Source Sometimes users mistakenly install the GT Document Update Tool

or a standalone "Data Transfer Tool" and expect it to function as the full designer. MITSUBISHI ELECTRIC Global website Full Suite Requirement : Ensure you have installed from the original GT Works3 DVD-ROM or the full downloaded installation package from the Mitsubishi Electric FA website Admin Rights : Always right-click the and select Run as Administrator

to ensure the license registry keys are correctly written to the Windows Registry. MITSUBISHI ELECTRIC Global website 4. OS Environment Settings

In some versions, specific Windows settings can interfere with how dialog boxes and license prompts appear. Font Scaling

: If your font size is set to "Large" or custom scaling in Windows, some GT Designer dialog boxes

may fail to display correctly, leading to hidden errors. Set Windows scaling to 100% (Normal) Regional Settings : For older versions (GT Designer 5/6), ensure your Windows Regional Settings are set to Always keep the original license DVD and registration card

if you encounter "Internal error: null pointer access" at startup. MITSUBISHI ELECTRIC Global website Preventing Future License Errors Help For Data Transfer Tool - Mitsubishi Electric

Here are a few options for a social media or forum post, depending on your specific goal (e.g., asking for help vs. sharing a solution).

Resolved: Troubleshooting the "GT Designer License Not Found" Error (Mitsubishi Electric)

Applies to: GT Designer3 (GOT2000 Series), GT Works3, and older iterations of Mitsubishi Electric’s HMI configuration software.

If you are an automation engineer or maintenance technician, few things are as frustrating as sitting down to modify a Human-Machine Interface (HMI) project, launching your software, and being greeted by the dreaded red banner: "GT Designer License Not Found."

You know you purchased the software. You have the USB dongle plugged in (or the license file installed), yet the software refuses to launch in "Full Mode" (Edit mode), often relegating you to a read-only "Monitor Mode."

This article will dissect exactly why this error occurs and provide a step-by-step guide to forcing the software to recognize your valid license.

7. Prevention Tips

• Always keep the original license DVD and registration card.
• Do not plug/unplug USB dongle while GT Designer3 is running.
• Back up SoftGOT license .lic files and activation emails.
• Before reformatting PC → deactivate SoftGOT license (if allowed).

1. Switch to "Hardlock" (The Dongle)

If you are using a soft license (tied to your hard drive), a single SSD failure or Windows reinstall will permanently lock you out (requiring Mitsubishi support to recover the license). The USB dongle is portable and survives OS rebuilds.

2. Immediate Checks

| Check | Action | |-------|--------| | Do you have a physical license? | For GT Designer3 (non-SoftGOT), a license is usually a USB dongle or software license certificate. | | Is the USB dongle inserted? | Check Device Manager → Universal Serial Bus devices → “MELSEC License Key” or similar. | | Is it SoftGOT? | SoftGOT requires a dedicated license (separate from GT Designer3). | | Did you install the License Manager? | Mitsubishi’s “License Manager” tool must be installed. | | Is License Manager service running? | Open Services → “MELSOFT License Manager” → Status should be “Running”. |

Concrete fixes

• If license file missing: restore from backup or download replacement from vendor portal; place in the required folder (often the app install directory or %PROGRAMDATA% vendor folder).
• If expired: renew license through vendor; apply updated license file.
• If wrong path: locate license configuration (app settings or .ini) and set correct path; ensure environment variables (e.g., LM_LICENSE_FILE) point to license file or server.
• If license server down: restart license server daemon/service (lmgrd, rlm, etc.) on the server; on client, point to alternate server if configured.
• If permissions: ensure license file and install folder grant read to the service account and current user; remove restrictive ACLs.
• If hardware ID changed: request vendor reissue or migrate license using vendor’s license transfer tool.
• If blocked ports: open needed TCP/UDP ports on firewall or router; allow the vendor’s license manager executable.
• If corrupted: replace license file from vendor and run checksum if provided; reinstall GT Designer.
• If clock skew: set system clock to correct time or enable network time sync.

2. USB Dongle Specific Fixes

If you have a physical license key:

• Install the Sentinel driver (found in GT Designer3 installer folder under \Drivers\Sentinel)
• Check Device Manager → Look for Sentinel HL Key or HASP Key under Universal Serial Bus devices.
  • If missing → driver issue
  • If yellow exclamation → reinstall driver
• Test the dongle on another PC – If it works there, your USB port or OS has the issue.

Step 5: Clean Uninstall and Reinstall (Nuclear Option)

If the above fails, the license registry is corrupted.

1. Uninstall GT Designer3 via Control Panel > Programs and Features.
2. Uninstall MELSOFT Activation Utility.
3. Delete the remaining folders: C:\Program Files (x86)\MELSOFT and C:\ProgramData\MELSOFT.
4. Run a registry cleaner (like CCleaner) or manually search for MELSOFT in regedit and delete keys (only if you are advanced).
5. Reboot.
6. Reinstall GT Designer3 as Administrator (Right-click > Run as Administrator).
7. Activate your license before opening the main software.

Step 3: License Manager Service is Stalled

GT Designer relies on a Windows service called "Sentinel LDK License Manager" or "HASP License Manager."

How to restart it:

1. Press Windows Key + R, type services.msc, and press Enter.
2. Scroll down to find Sentinel LDK License Manager.
3. Check the "Status" column. If it says "Running," right-click it and select Restart.
4. If it is not running, right-click and select Start.
5. Ensure the "Startup Type" is set to Automatic.
6. Close Services, re-launch GT Designer3.