A safer approach is to avoid such tools entirely. If you absolutely need an offline activation method for legacy Windows (e.g., for a vintage gaming PC), consider like Microsoft Activation Scripts (MAS) which are script-based, readable, and have less malware history—but still violate the EULA.

Chew WGA (Windows Genuine Advantage) is a created by a well-known warez group. The “v0.9” version is one of the most circulated releases. Its primary function is to disable or permanently remove WGA validation checks in Windows XP, Windows Vista, and Windows 7.

Microsoft allows indefinite unactivated use with limitations:

Here are some frequently asked questions about Chew WGA V0.9:

If you are looking for a guide to "Chew WGA," the safest and recommended path is to use a legitimate version of Windows: