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One. Run the application in administrator mode
2nd. Select the operating system.
3rd. Select the server.
4th. Click "Activate" it may take a while to activate depending on the speed of your internet.

Microsoft Windows 8
Microsoft Windows 8 Enterprise
Microsoft Windows 8 Professional
Microsoft Windows Server 2012 Datacenter
Microsoft Windows Server 2012 Standard

Activation is valid for 180 days before expiry reactivate the system.

I have the keys of all versions, but only the liberated this app I tested. In future versions will releasing the other keys.

If you can not enable change your DNS servers to Google (8.8.8.8 and 8.8.4.4)

I forgot to write:
This activation removes the "watermark" and enables the customization of the start screen.