In cases where the key appears invalid or expired prematurely, checking the system date and time is a necessary troubleshooting step. If your computer's clock is incorrect, the software may miscalculate the remaining subscription period. If the date is correct and the key still shows as invalid, contacting eScan technical support with your purchase receipt is the final recourse to restore your service.
Registering your new eScan license. To register your new eScan license key, click on Start, then on Programs > eScan for Windows > Know How to Register/Activate Your Product - eScan how to check escan license key