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KMSAuto works by emulating a KMS host on the local machine. When a user installs the app, it automatically detects the installed Microsoft products and activates them using a generic KMS key. The app then communicates with the Microsoft activation servers to validate the activation.

A lightweight, faster version designed for one-click activation. It is often preferred for its small file size (approx. 1.2 MB) and lack of a .NET Framework requirement.