They often modify core system files that can cause the "Blue Screen of Death" later on.
This is the most common "manual" way to activate without third-party software. Open Command Prompt as Admin: Windows Key + X and select Command Prompt (Admin) Windows PowerShell (Admin) Install the KMS Client Key: Type the following command and press Enter: slmgr /ipk GCRJD-8NW9H-F2CDX-CCM8D-9D6T9
Go to File > Save As. Name the file activate.bat and ensure "All Files" is selected in the file type dropdown.
Activating Windows 8.1 Pro Build 9600 without a manually entered product key is often possible through official channels if you have previously owned a licensed version of the software. For devices that came pre-installed with Windows 8 or 8.1, the in the motherboard's BIOS, allowing for automatic activation upon reinstallation. Official Recovery and Activation Methods