The exact you are installing (GT Works3, GT Designer3)? Whether this is a fresh installation or an update ?
If you are using a software-based license (Product ID), it is possible the configuration files are corrupted. You may need to clear the old configuration, similar to troubleshooting other software, by locating configuration files in C:\Users\ \AppData\Local or Roaming and rebooting. 4. Re-Register via GT Works3 Installer
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
If the error persists, document the exact error message and code. gt designer license not found
Add the entire MELSOFT installation directory to the exclusion list. The default path is usually: C:\Program Files (x86)\MELSOFT\ or C:\MELSOFT\ . Restart your computer and test GT Designer. 5. Repair the MELSOFT Installation
Launch GT Designer. If the error disappears, add the Mitsubishi/MELSOFT folder to your antivirus . 5. Update Your Software
. By right-clicking the GT Designer icon and selecting "Run as Administrator," many permission-based blocks are bypassed. If the error persists, the user should verify the license via the "MELSOFT Management Tool." The exact you are installing (GT Works3, GT Designer3)
Run the original installation media. Ensure you install the Base/Full Version first before applying any service pack updates.
If you have multiple MELSOFT products (like GX Works), ensure they aren't using a conflicting license manager version. Installing the latest often updates the license manager for all tools. When to Contact Support
MELSOFT software interacts deeply with system directories and registry hives. If GT Designer3 is launched from a standard user account without administrative privileges, Windows may block the software from reading its own licensing files. 4. Conflicting MELSOFT Environments You may need to clear the old configuration,
GT Designer requires deep access to system folders and registry keys to verify its license. Standard user accounts often block this.
Once your license is working, consider backing up the Mitsubishi registry hive located under HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\MITSUBISHI to quickly restore parameters if a Windows update corrupts them later.