How can i activate windows 10 without product key?  

it gave me this one :) sorry for late reply

And that is your problem. Your computer originally had Windows 8 SINGLE LANGUAGE edition on it which upgraded to Windows 10 Single Language. You installed Windows 10 regular. You need to download Windows 10 Single Language edition and install that.



You want the bottom choice.

Or in Media Creation Tool:

Hi navy thank you for your support, one last question, can I directly change my system from windows 10 home to home single language? i have bad connection of internet so it would take time to download the windows 10 home single language. Also the download fails a lot.

Stupid question time: What is Windows 10 Single Language edition, and where / why would it be used as opposed to regular?

Superfly said:

OK, I'll bite here...

Single Language, as the name suggests, only allows one language to be installed. It originated as a down-scaled version of Core for emerging markets, in order to provide a cheaper final product to those consumers via the OEM's ( i.e the OEM's paid less for those licences than the full Core/Home editions) and thus could provide the emerging markets with a cheaper final product...

Ok - thanks, and that is what I figured, but it seemed too obvious / simple to be the answer... Live and learn, right?