Hello Paul,
Thank you for posting question on Microsoft Windows Forum!
Well! To upgrade your Windows Home edition to Windows Pro online and pay for it directly. You can follow below steps.
- Open Activation Settings by going to Start > Settings > System > Activation.
- Looking for the section titled Upgrade your edition of Windows. Click on Open Store (or Go to the Store).
- The Microsoft Store will open to the Windows Pro upgrade page. You will see a button to Buy or Get. Follow the prompts to pay using your Microsoft account.
- Once the payment is confirmed, click Install. Your PC will begin the upgrade process and will likely restart once or twice.
- The upgrade license is linked to your Microsoft account.
You can consult below article for more information regarding upgrading from Windows Home to Windows Pro.
Hope the provided information is helpful! If it is. It is appreciated to consider clicking "Accept Answer". Should you have more questions, feel free to leave a message.