To upgrade a cluster node running on Windows Server 2012 R2, see Cluster Operating System Rolling Upgrade In practice, the exact process will depend on factors such as the deployment topology of your availability groups and the commit mode of each replica.You can update the keys remotely with the help of Bidirectional or unidirectional update process.The diagram below shows the process of updating keys.Updating Keys Remotely (Bidirectional update) The Super Pro hardware/software keys can also be updated by using the Unidirectional update process that does not require a locking code (sent by the customer).For computers running Windows Vista or Windows 7, the activation threshold is 25.Use this table to find the correct Generic Volume License Key (GVLK) to use our Key Management Service (KMS) with the edition of Windows installed on your computer.
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KMS clients contact the KMS host by using remote procedure call (RPC).
KMS can be hosted on computers that are running the Windows Vista, Windows 7, Windows Server 2003, Windows Server 2008, or Windows Server 2008 R2 operating systems.
Your software vendor might have directed you on which tools/utilities you can use to update the keys.
Usually, you are provided with the Field Exchange Utility to update the keys.