Have you ever activated Windows? If so, you could try to activate your Windows by Phone.
To activate your Win 10 by phone, follow these steps:
Windows logo key + R -> Type ‘Slui 4’ into the Run box -> Enter
Select your Country/Region from the list -> Next
You will be given a toll-free phone number -> Use this number to get your confirmation ID -> Activate
If your Windows 10 never activated, you need to buy a valid license.
If your Windows 10 is pre-installed by OEM, contact manufacturer support for help.
About Windows update issue, manually reset windows update components:
Right click on the start button and select Powershell (admin) or Command Prompt (admin)
Write the next hit enter after each line.
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
After completed, restart computer and check for updates again.
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