| License Type | What to look for | Common issue | | :--- | :--- | :--- | | USB Hardware Key (Dongle) | Green or blue USB stick from Mitsubishi | Driver not installed / Port issue | | Software License (License Manager) | Activation code + online/offline activation | Expired or not transferred | | Trial License | Temporary 30–60 day license | Trial period ended |
| Message you see | Likely cause | | :--- | :--- | | License not found | No dongle / License Manager missing | | License invalid | Corrupted license or wrong version | | License expired | Time-limited license ended | | Cannot find Sentinel key | USB driver not installed | gt designer license not found
Would you like the step-by-step for reinstalling the Sentinel USB driver specifically? | License Type | What to look for
If you are using a soft license (tied to your hard drive), a single SSD failure or Windows reinstall will permanently lock you out (requiring Mitsubishi support to recover the license). The USB dongle is portable and survives OS rebuilds. | Message you see | Likely cause |