Hi,
Windows Home Single Language edition is different with Windows Home edition, which cannot upgrade to Windows 10 Pro edition directly via change generic Pro product key.
You need to clean install Windows 10 Pro edition then use your valid product key to activate system.
Or clean install Windows 10 Home edition(not Home Single Language), upgrade by Pro generic product key, next, activate by valid Pro license.
Please note: backup your important personal data before clean install. Download Windows 10 ISO file from here:
https://www.microsoft.com/en-us/software-download/windows10
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