Ensure you are using a Microsoft account associated with a valid digital license.

Using activator tools violates Microsoft’s Terms of Service and is considered software piracy, which can lead to legal action.

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

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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.

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

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