Windows 10 Professional Key
1. Visit https://www.microsoft.com/en-in/software-download/windows10ISO
2. Select Version & Language.
3. Click Confirm and Download the ISO.
4. Make bootable USB/DISK using Windows MEDIA Creation Tool/Rufus Software.
5. Install your windows.
6. During Installation when asked for key click “SKIP”.
7. Once installation is done, go to UPDATE AND SECURITY.
8. Select ACTIVATION and enter your product key there.
9. Now Windows is activated.

During installation, you’ll be prompted to enter a product key.  Or, after installation, to enter the product key, select the Start  button, and then select Update & Security  > Activation  > Update product key > Change product key.