From the myITforum TipLine:
One of the first places to turn to try to troubleshoot installation problems for Windows Updates is the CBS.log file.
As you can see in the image below, every intricate detail of the installation is recorded. To quickly locate problems, search the log file for any of the following words:
“failed” “failure” “error”
Extra Tip: The CBS.log file can get pretty large. Use something other than Notepad to review it.
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