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  1. To use a KMS key to activate Windows 10, you need to12:
    • Open an elevated Command Prompt window.
    • Run the command cscript.exe slmgr.vbs /ipk <KMS_Key> to install the KMS key.
    • Activate the KMS key online or by phone.
    • Alternatively, you can use the Volume Activation Management Tool (VAMT) to install and activate KMS Client keys on multiple computers.
    Learn more:

    To activate KMS on a client version of Windows, follow these steps:

    • Open an elevated Command Prompt window.
    learn.microsoft.com/en-us/windows/deployment/vo…

    To install a KMS Client key

    • Open VAMT.
    • In the left-side pane, select Products to open the product list view in the center pane.
    learn.microsoft.com/en-us/windows/deployment/vo…
     
  2. Key Management Services (KMS) client activation and product keys

     
  3. Appendix A: KMS Client Setup Keys | Microsoft Learn

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