Always store your license key in a digital vault or physical sticker on the software box.
the software, ensuring you enter the Product ID carefully when prompted. Do not skip this step to "enter it later." Tips for Avoiding License Issues
Navigate to the directory where GT Works3 is installed (usually C:\Program Files (x86)\MELSOFT ). Look for a utility named or similar. gt designer license not found
Troubleshooting the "GT Designer License Not Found" Error If you’re working with Mitsubishi Electric’s HMI software, seeing the (or "License Key Not Found") message can bring your project to a screeching halt. This error typically occurs when the software cannot verify that a valid product ID has been registered on the system.
Whether you've just reinstalled the software or it suddenly stopped working, Common Causes of the License Error Always store your license key in a digital
Mitsubishi often includes a management tool within the installation folder.
The most reliable fix is often to re-input your license key. You don't always need to uninstall the whole suite to do this: Look for a utility named or similar
Open the (if installed as part of GT Works).
Windows registry keys associated with the MELSOFT license have been moved, deleted, or corrupted.