If the "Build 9600" watermark stays after activation, restart the Explorer.exe process or reboot the server. 5. KMS vs. MAK: Which key do you have?
The simplest way to activate is through the Server Manager or System settings. Navigate to Control Panel > System and Security > System and select "Activate Windows." Enter your 25-digit retail or volume license key here. If the "Build 9600" watermark stays after activation,
If your build shows and will not accept a standard Retail or MAK key, you may need to convert the edition first using the Deployment Image Servicing and Management (DISM) tool: If the "Build 9600" watermark stays after activation,
If you receive error 0x80072EFD (cannot connect to activation servers), Microsoft may have deprecated the activation endpoint for very old builds. In that case: If the "Build 9600" watermark stays after activation,