It creates a virtual KMS server on the local machine. Windows and Office products "check in" with this local emulator instead of Microsoft's official servers to verify their license.
It can convert Retail versions of Office into Volume License (VL) versions, making them compatible with KMS activation. Version & Compatibility HEU KMS Activator 27.0.2 Portable
Generally supports Windows Vista, 7, 8, 8.1, 10, 11, and Windows Server. It creates a virtual KMS server on the local machine
Some versions attempt to use "Digital License" (HWID) activation, which permanently activates the system without requiring periodic renewals. Version & Compatibility Generally supports Windows Vista, 7,
Compatible with Office 2010, 2013, 2016, 2019, 2021, and Office 365. Critical Risks and Legality
HEU KMS Activator 27.0.2 is an unofficial, third-party software designed to activate various versions of Microsoft Windows and Office by emulating a Key Management Service (KMS) server.
Using HEU KMS Activator involves significant legal and security considerations: Activate using Key Management Service | Microsoft Learn