Windows 8.1 KMS Activator Ultimate is the most Simple & user-Friendly activator for Windows 8.1 It is Safe activator with no harm to System Files Period of activation is 180 days and you can renew it You can remove any previous activations You can know informations about your activation, your window s serial and the rest days of activation It Activates : Windows 8.1 Professional Windows 8.1 Professional_N Windows 8.1 Enterprise Windows 8.1 Enterprise_N Windows Server 2012 R2 Server Standard Windows Server 2012 R2 Datacenter Windows Server 2012 R2 Essentials Windows 8 Professional Windows 8 Professional N Windows 8 Enterprise Windows 8 Enterprise N Features in 1.5 -New Design -Stable Version -Update KMS server every day -Add Activation: Windows 8 Professional Windows 8 Professional N Windows 8 Enterprise Windows 8 Enterprise N -Fixed all bug. Requirements: Net Framework 2.0 Internet Connection Instructions:Install the Application first. After Install. Run The Application "As Administrator" to Get it to Work. Click on "Clean Activation History". Click on "Update Server" to Update KMS Server. Select Your Windows. Click on "Activation Now". Done, Enjoy.