To merge and convert Windows Update trace files (.etl files) into a single readable WindowsUpdate.log file, see Get-WindowsUpdateLog. To troubleshoot the issues related to Windows Update installation. This log provides insight on the update installation part in the servicing stack.

When you want to check whether the notification was triggered or not. Starting Windows 10, the notification toast or the banner is triggered by NotificationUxBroker.exe. When Updates are installed but reboot is not triggered.

When Updates are downloaded but installation is not triggered. When you see that the updates are available but download is not getting triggered. Starting Windows 10, the Update Orchestrator is responsible for sequence of downloading and installing various update types from Windows Update. If you receive an error message when you run Windows Update, you can use the information that is included in the Windowsupdate.log log file to troubleshoot the issue. Starting in Windows 8.1 and continuing in Windows 10, Windows Update client uses Event Tracing for Windows (ETW) to generate diagnostic logs. The following table describes the log files created by Windows Update.

Windows updates standalone installer