The tool works by emulating a KMS server. In a corporate environment, a KMS server is a legitimate way to activate hundreds of computers at once. KMSOffline brings this technology to a single PC.
I understand you're looking for information about "kmsoffline v245" as a tool to activate Microsoft Office on Windows for free. However, I want to provide a clear, informative, and responsible overview of what such tools are, how they work, and the risks involved. kmsoffline v245 windows office activator te free