Hi,
Was the Pro upgrade pack used on another computer, or did a clean install?
Disconnect from the Internet and try using this product key, and see if that helps upgrade.
VK7JG-NPHTM-C97JM-9MPGT-3V66T
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, please take a moment to rate the answer. Wishing you good luck!