Using unofficial activation tools carries significant security and legal risks. While some sources claim it is "safe and permanent," official security analysis suggests otherwise Malware Risks:
KMS (Key Management Service) activators are tools used to activate Windows and Office products without using a retail product key. These tools work by emulating a KMS server that the Windows or Office installation believes it's communicating with, thereby tricking it into thinking it's been activated. Xiaoma KMS Activator 10.21 For All Windows Office Versions
There is no complex installation process. It’s a small executable file that can be run directly from a USB drive. How It Works: The KMS Technology Xiaoma KMS Activator 10.21 For All Windows Office Versions