Windows 10: How to purchase win 10 pro and activate digital license? previous Win 10 Home single...

Previously my user's PC upgraded from windows 8 single language with key activated, to windows 10 home single language.After the OS upgrade, digital license was lost and not found on OS.I am planning to purchase Windows 10 Pro.How to purchase windows 10 pro?How to change from Win 10 Single languagenot activated to win10 pro and activate digitally?

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Win 10 home single activated with digital licence to win 10 pro

I have a pc with windows 10 home which is activated by digital licences or OEM. that means it gets activated whenever its connected to internet. But i am thinking to have a windows 10 pro is in my pc. How to change that. When ever I enter my win 10 pro key in change product key section it's still showing win 10 home single os. Can anyone resolve it

 

Win 10 pro installation with retail channel key to be converted to OEM/Digital license and activated without formatiing or reinstallation

I have OEM Win 10 Pro license purchased along with the hardware, but used an image with retail channel product key while deploying Win 10 pro. Is there a way to activate with OEM digital license without reinstalling ?

Work arounds done: Tried removing the product key(slmgr.vbs -upk) and tried activation but failed.

 

Win 10 License transfer.

I have just built a new PC from scratch and would like to transfer the license from the old to new. It was a Win 10 Pro upgraded from a purchased copy of win8 (not OEM). It is activated with a digital license linked to my account. I will . not use the old PC afterwards. Have tried the activation troubleshooter but only the old PC shows up. Any suggestions?