Unfortunately to upgrade from Windows 10 Home to Windows 10 Pro you will need a valid product key or a digital license for Windows 10 Pro.
For more information, see:
Upgrade Windows 10 Home to Windows 10 Pro
https://support.microsoft.com/en-us/windows/upgrade-windows-10-home-to-windows-10-pro-ef34d520-e73f-3198-c525-d1a218cc2818
If you do have an old product key from Windows 7 Pro, Windows 7 Ultimate, or Windows 8/8.1 Pro, then these keys can be reused to enable an upgrade from Windows 10 Home to Windows 10 Pro
Reference:
How to upgrade from Windows 10 Home to Pro for free
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