Gt Designer License Not Found _verified_ Here

If you are a automation engineer, technician, or developer using Mitsubishi Electric's HMI software, you may have encountered the frustrating error: (often appearing within GT Works3 or GT Designer3).

Windows User Account Control (UAC) can block the license verification paths. Close all open MELSOFT processes. Right-click the execution shortcut. Select Run as Administrator .

Sometimes, Windows User Account Control (UAC) blocks GT Designer3 from accessing the registry hive where the license key is stored.

The license key was never entered during installation. gt designer license not found

Sudden power outages, registry cleaning software, or Windows updates can corrupt the specific files where MELSOFT stores registration data.

Troubleshooting "GT Designer License Not Found" Error: Full Guide

Open your Antivirus software (e.g., Windows Defender, McAfee, Norton). Navigate to the or Exceptions settings. If you are a automation engineer, technician, or

When the validation check fails, the application usually locks project editing or refuses to compile screens. Resolving the issue requires an understanding of how Mitsubishi packages its MELSOFT engineering suite and how Windows manages registry permissions. Root Causes of the Error 1. Software Version Mismatches and Overwrites

Uninstall GT Designer and the MELSOFT License Management tool via the Control Panel.

: If your font size is set to "Large" or custom scaling in Windows, some GT Designer dialog boxes Right-click the execution shortcut

Try these solutions in order, from simplest to most complex.

Let's systematically work through the most frequent reasons for this error, from simple oversights to more complex system issues.

An invalid or mistyped Product ID during installation is the most common cause of this error.

Standard trial keys or standard PLC developer keys (like GX Works) will work for GT Designer; you must use a dedicated GOT HMI software license key. 🖥️ Step 3: Repair the Windows Registry