Hello, I’m Virginia an independent advisor with 20 years of expertise in fixing my own & friends’ PC problems.
Which Windows version are you running - 1903, 1909 Or 2004?
Are you running any third party antivirus? If so try disabling it to see if this is preventing the updates from downloading.
Have you tried resetting the update components?
Open cmd prompt/powershell with admin & enter:
Net Stop bits
Net Stop wuauserv
Net Stop appidsvc
Net Stop cryptsvc
Ren %systemroot%SoftwareDistribution SoftwareDistribution.bak
Ren %systemroot%system32catroot2 catroot2.bak
Net Start bits
Net Start wuauserv
Net Start appidsvc
Net Start cryptsvc
Restart the PC & try updating again.
If this fails/doesn’t correct the problem then click start, run, type regedit & click enter & find: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
Try deleting the entries WUServer and WIStatusServer in the right pane if they’re there, if not don’t worry.