If you’ve purchased a valid Windows 10 Pro product key and you wish to upgrade your standard version of Windows 10 to Professional, here are the instructions:

1. Right Click on the Start Button and choose System from the menu which pops up
   
2. On the Windows that pops up scroll down to Windows Activation and click on Change Product Key
   
3. Enter your Windows 10 Professional Product Key.  The Cancel button will change and allow you to continue to upgrade your Windows 10 version once you’ve entered in a valid Windows 10 Pro product key.
   
4. Your computer will restart after installing the new Window 10 Pro features.