If you purchased a physical copy of Windows 8.1 Pro, the key is printed on a sticker inside the original box, usually located on a card or directly on the installation disc sleeve. 2. Digital Purchase Confirmation
Type your 25-character key and click to activate via Microsoft servers. Method 2: Using the Command Line (SLMGR) windows 81pro build 9600 product key extra quality
If you can tell me if you are using a , OEM , or trying to activate via KMS , I can provide more specific instructions on how to ensure your activation is permanent. If you purchased a physical copy of Windows 8