How to Clear Windows Update Cache
Sadly, the process is not particularly straightforward.
The first step is stopping the Windows Update service. Search for Services, right-click on the top result, and open it as an administrator.
Next, scroll down the list of entries until you find Windows Update. Right-click on it and choose Stop.
Now you’ll need to delete the files. Press Windows key + R to open the run box, then type C:\Windows\SoftwareDistribution\ and hit Enter.
You can delete everything within the Downloads folder.
Lastly, you’ll need to head back to services and re-enable Windows Update.