Redeeming a Windows 11 Enterprise key is really simple, just follow these steps:
To download Windows 11 visit this page: https://www.microsoft.com/en-us/evalcenter/download-windows-11-iot-enterprise-ltsc-eval
During installation, you'll be prompted to enter a product key. Or, after installation, to enter the product key, select the Start button, and then select Settings > System > Activation.