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
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 an option labeled or "License." Re-enter your 10-digit or 12-digit Product ID. 3. Check the "GT Designer3 Management" Tool gt designer license not found
Open the (if installed as part of GT Works).
Windows registry keys associated with the MELSOFT license have been moved, deleted, or corrupted. the software, ensuring you enter the Product ID
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
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. Before diving into technical fixes, try right-clicking the
the MELSOFT folders in both Program Files (x86) and ProgramData (note: ProgramData is a hidden folder). Restart your computer.
If you use GT Designer on a VM (like VMware or VirtualBox), ensure the VM has consistent hardware ID settings, as some licenses tie themselves to the virtual hardware signature.
Whether you've just reinstalled the software or it suddenly stopped working, Common Causes of the License Error