Aug 02 2021
Cumulative update preview for windows 10 version 20H2 for x64 - based systems (KB5004296)
Aug 14 2021
Please run the below commands in CMD. Ensure you run CMD as an admin. These commands will delete the Windows Update registry log on your machine and then next time you click on check for updates, WU will check against the entire WU database.
Reg delete HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate
Net stop wuauserv >NUL
rmdir softwaredistribution /s /q
Net start wuauserv >NUL
I am sure this will help. Let me know how you get on.