Instead of using third-party activators, it is highly recommended to use official methods:

Are you trying to activate a specific version of Windows or Office? Activate Windows - Microsoft Support

AAct Portable (including versions similar to 4.2.8) is a KMS-based activator tool designed to activate Windows operating systems and Microsoft Office suites without a legitimate license key. It is popular for its portable nature, requiring no formal installation.

Purchase a legitimate product key from Microsoft Support .

Activates Windows 10/11 and Office products by emulating a Key Management Service (KMS) server.

Downloading cracks, activators, or keygens from untrusted sources often leads to malware, ransomware, or trojan infections.