Gt Designer License Not Found _top_ | VALIDATED |

Error message: "GT Designer license not found"

Part 7: When to Contact Mitsubishi Support

If you have tried all the above and still see "License Not Found," you may have a hardware failure or a corrupted activation server record. Gather the following before calling your distributor or Mitsubishi support:

The Product ID (found on the CD case or email receipt).
The Activation Code (if you received one).
Screenshot of mactchk.exe results.
Screenshot of Device Manager showing the dongle (if applicable).
Windows Event Log errors (Run eventvwr.msc > Windows Logs > Application, filter for "MELSOFT").

Pro tip: Mitsubishi licenses have a "recovery" feature. If you’ve lost your license due to a hard drive crash, you can request a License Recovery Certificate from your regional Mitsubishi office. They will issue a new key if you prove the old PC is decommissioned.

Option 2: Sharing a Solution (LinkedIn/Twitter style)

Best for sharing a quick tip if you figured it out and want to help others.

Headline: Solved: The Case of the Missing GT Designer License 🛠️ gt designer license not found

Body: If you just installed Mitsubishi GT Designer3 and are getting a "License Not Found" error immediately upon startup, don't panic. Here is the checklist that solved it for me:

1️⃣ Check the Package: Unlike some other HMI software, GT Designer typically requires a valid license disk or key code. 2️⃣ The Environ Tool: If you have the key, you need to register it via the "License User Registration" tool found in the Start Menu folder (under GT Designer3 > Tool). You can't just paste it into the login screen. 3️⃣ Dongle Check: If you have a hardware key, ensure the drivers are installed. Some versions require the USB key to be inserted before the install.

Hope this saves someone the 2 hours of troubleshooting I just went through! #Automation #Mitsubishi #HMI #EngineeringTips #GTDDesigner Error message: "GT Designer license not found" Part

Step 5: The "Soft License" vs "Hardlock" Conflict

Modern versions of GT Works3 allow license binding to the PC's hard drive (Software License) instead of a USB dongle. The error appears if the software is looking for one type but finds the other.

Scenario A: You used a USB dongle for years, but recently installed an update that defaults to "Find Software License."
Scenario B: You performed a Windows reset. The soft license (stored in the registry) was wiped, but the software still looks for it.

The Fix: Run the License Transfer Tool

Open the MELSOFT License Manager from your Windows Start Menu.
Go to "View License Status."
If it shows "No License," but you have a USB dongle, click "Activate License" and choose "License Key (Dongle)."
Force re-read the dongle by clicking "Refresh."

Part 6: Prevention and Best Practices

Once you resolve the "License Not Found" error, follow these rules to ensure it never returns: The Product ID (found on the CD case or email receipt)

Never move or rename the license file after activation. Keep it in C:\ProgramData\MELSOFT\LICENSE.
Image your hard drive after a successful activation. If the error recurs, restore the image.
Disable automatic antivirus scans of the MELSOFT folder. Schedule manual scans instead.
Do not use Windows System Restore to a point before activation—this corrupts the license.
Back up your license key (Product ID and Password) in a secure, offline location.

B. GT Designer3 with USB dongle

Dongle LED should blink when software starts. If not:

Try a USB 2.0 hub.
Install latest Sentinel driver from Thales (HASP/Sentinel HL).
Check for broken pins on dongle.

Troubleshooting steps (ordered)

Restart GT Designer and your PC.
Confirm license file location: ensure the license file (e.g., *.lic or license.dat) is in the directory specified by GT Designer settings or the environment variable.
Check permissions: make sure your user account has read access to the license file and its folder.
Verify license activation: open the license manager or activation tool and confirm the license status is “Activated” and matches your product version.
Match versions: confirm the license is valid for your GT Designer version and build.
Firewall/antivirus: temporarily disable (or whitelist) GT Designer and its license service in firewall/AV—some blockers prevent license validation.
Network license checks: if using a network license, ensure the license server is reachable (ping server hostname/IP) and the license daemon is running.
Reinstall license: if available, reapply the license or run the activation utility again.
Logs: check GT Designer logs or license manager logs for detailed error codes to share with support.
Contact support: gather your machine ID, GT Designer version, license key/license file, exact error message, and a screenshot; then contact vendor technical support.