This error is a Windows 10 activation bug. It occurs when the PC's owner upgrades the system from older Windows versions (Windows 7, 8, 8.1) to Windows 10.  We highly recommend doing a clean install instead. Please check the link below according to your Windows version

If you're hesitant to perform the clean installation, you may want to try the solutions provided here.

However, if the above solution does not work or you do not wish to do the solution above, please contact our Customer Support Team via Support Tickets on your EF Dashboard so we can check if you are eligible for a refund or replacement. 

To assist you better, please include the details below:

1. Order / Transaction ID

2. Screenshot of the pop-up/error message '

3. Additional information (if any)