Whether you've just reinstalled the software or it suddenly stopped working, Common Causes of the License Error
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. gt designer license not found
The software is being run without the necessary administrative privileges to access license files. Whether you've just reinstalled the software or it
The Product ID was never entered during the initial installation of the GT Works3 suite. The Product ID was never entered during the
Windows registry keys associated with the MELSOFT license have been moved, deleted, or corrupted.
Before diving into technical fixes, try right-clicking the GT Designer icon and selecting Windows occasionally blocks software from reading license data stored in protected system folders. If this works, you can set it to always run as admin via the Compatibility tab in "Properties." 2. Re-register the Product ID
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: