If your Windows 10 system reports that FRED cannot be activated as the product key was used on another device, apply the key assigned to the system. The Certificate of Authenticity (CoA) is applied to the back of the system that contains your system's license key.
Here are the instructions on changing the key:
1. Open Settings.
2. Click on Update & security.
3. Click on Activation.
4. Click the Change product key link.
5. Type your 25-digit product key found on the CoA sticker on the back of your FRED system.
6. Click Next to complete the process.
If the activation process completes successfully, you'll get the "Windows is activated" message.