- Select the Start button, then select Settings > Update & security > Activation.
- Select Change product key, and then enter the 25-character Windows 10 Pro product key.
- Select Next to start the upgrade to Windows 10 Pro.
If you to do fresh Windows 10 professional installation on the new hard drive on pre-install Windows 10 home laptop/desktop. Get this embedded license key Windows 10 professional DVD, by click on the picture below.
- Boot from the DVD, and go through straight into self-explain steps.