https://zhidao.baidu.com/question/939838642868539452.html
Press Win key + X key, press the A (open an administrator command prompt);
3, copy slmgr / upk (enter OK, meaning the key before unloading);
4, copy slmgr / ipk 4R6KN-TWVVD-JGD3D-HQ8HY-VQVQQ and then press ENTER for successfully installed, the software activates the operation.
These are the Win8.1 Pro activation method, and the method is very simple. We just need to get an activation key or use tools on it, hoping to help to you.