After following these steps, you can verify that the "Build 9600" watermark is gone and your system is active: Activate Windows - Microsoft Support
Activating Windows 8.1 Pro (Build 9600) without a product key involves several methods ranging from legal recovery to unofficial third-party activators. While Windows 8.1 can be installed and used with limitations without activation, permanent activation typically requires a genuine license Microsoft Learn Activation Methods Overview online & Microsoft Support Product Activation Portal
This method uses a generic KMS client key to connect your system to an activation server. :
Type the following command and press Enter (this uses the generic Volume License Key for Windows 8.1 Pro): slmgr /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX Set KMS Server:
Microsoft allows you to use Windows indefinitely without activation. You cannot change personalization settings, and a watermark persists, but core functionality (browsing, office work, gaming) remains available.
A: No. After the grace period (30–120 days), the OS will lock personalization, show persistent watermarks, and eventually refuse to boot into the desktop without activation.
If you cannot afford a Windows 8.1 Pro product key, do not resort to hacking. Instead, consider these options:
