How was Windows 10 installed on the computer, did it come preinstalled, was it a free upgrade from a previous version?
Which edition of Windows 10 is installed now?
Windows 10 Activation reports your license will soon expire.
Use the appropriate product key for the edition of Windows 10 you have installed.
If Windows 7 or Windows 8 came preinstalled, use that that product key to update the product key values.
or use one of the following product keys:
1) Enter the Windows 10 Home/Pro default key. (see list below)
Windows 10 Home: YTMG3-N6DKC-DKB77-7M9GH-8HVX7
Windows 10 Pro: VK7JG-NPHTM-C97JM-9MPGT-3V66T
Warning: please ensure you use the right product key for the right edition.
Click Start > Settings > Update & security
> Activation > Change the product key then enter the new product key then click
Next to Activate