Hi,
Please try to download and install the update manually. If the installation is failed, this issue is not caused by the WSUS. Please try to check the CBS log. It may give some hints.
To download updates, please click the link below:
http://catalog.update.microsoft.com/v7/site/Home.aspx
If the installation succeeds, please post the windowsupdate.log here, it may tell us why the client fails to get update from WSUS server.
Best Regards.
Steven Lee Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.