| Symptom | Likely Cause | Remedy | |---------|--------------|--------| | | The .lic file was generated for a different MCT‑10 unit. | Double‑check the serial number on the hardware and request a new key from Danfoss. | | License file rejected after a firmware upgrade | Firmware version is newer than the one the key was generated for. | Download the latest license version from the portal (often the same file works after a simple “Refresh” button in the License Manager). | | Feature still greyed out after importing | The MCT‑Config session still runs with the previous configuration cache. | Close and reopen MCT‑Config, then re‑connect to the controller. | | Lost license file | Accidental deletion or hardware replacement. | Use the “License Retrieval” function on the Danfoss portal (requires the hardware serial and a registered user account). | | Key expires unexpectedly | You purchased a subscription‑based add‑on. | Renew the subscription via the portal; the renewed key will have a new validity period. |

During installation, enter this code and leave the "License Key" field empty.