To activate Windows 8 using Key Management Service (KMS), you typically use a client-server model designed for volume licensing
If Windows 8 volume clients fail to communicate with your designated Server 1 instance, use these diagnostic steps: windows 8 kms activator v20 index of server 1 install
Initiation: Click the red button or the "Activation" tab within the interface. To activate Windows 8 using Key Management Service