Windows Update Standalone Installer – Detailed Guide

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In this article describes the Window Update Standalone Installer (Wusa.exe), is a small utility which is used to install standalone updates. The Wusa.exe file is in the %windir%\System32 folder. Moreover, To Install update packages the Windows Update Standalone Installer uses the Window Update Agent API, however, standalone updates are updates that are not automatically available at Windows Update in your Windows PC. Update packages are used an.msu file name extension. The Windows Update Standalone Installer are associated with the .msu file name extension.

In this post, we describe the Windows Update Standalone Installer in the following Windows Operating System.

  • 1 = Windows Vista
  • 2 = Windows Server 2008
  • 3 = Windows 7
  • 4 = Windows Server 2008 R2
  • 5 = Windows 8
  • 6 = Windows Server 2012
  • 7 = Windows 8.1
  • 8 = Windows Server 2012 R2
  • 9 = Windows 10
  • 10 = Windows Server 2016 Technical Preview


In Windows 7, the Window Update Stand-alone installer viz. wusa.exe was introduced with some new features and improvements.

The Windows Update Stand-alone Installer(wusa.exe) provides some of the following improvements in Windows 7:


In Windows 7, wusa.exe includes uninstall support so that so that administrators can uninstall updates from a command line. However, prior to Windows 7, wusa.exe included install support only.

Users can uninstall an update by providing the package number (from the Microsoft Knowledge Base) of the update to be uninstalled or providing the path to the .msu file.


  • To uninstall an update by specifying the full path to the update using the following command.


  • By using this command this command to uninstall an update by specifying the update package number from the Microsoft Knowledge Base.




New parameters are available in Windows 7 to enable logging, contents of an .msu file are extracted and control the restart behavior when an update is installed in quiet mode.

/log: In the earlier versions this Switch is not available. This new parameter enables logging through the Wusa.exe tool and the logging could only be enabled through tracing tools.

/extract: previously contents of .msu files could only be extracted by using the expand.exe tool, moreover, this new parameter using wusa.exe tool to extracted the .msu file.


The Wusa.exe tool provides more information in error situation for better treatment. These tools are as follows:

  • update is already installed: 1 (S_FALSE)0x240006 (WU_S_ALREADY_INSTALLED)
  • update is not applicable: 1 (S_FALSE)0x80240017 (WU_E_NOT_APPLICABLE)


Follow these steps to view the Windows Update Standalone Installer Event log.

  1. Click start icon, in the Start Search box type Event Viewer, and then in the programs list click Event Viewer. Although, in Windows Server 2012 and Windows 8, on the Start Screen, type event viewer and then click Settings, and then under the Setting click View Event Logs.

Type the password or click Continue, If you are prompted for confirmation or for an administrator password.

  1. In Event Viewer, expand Windows Logs, and then click

in the middle pane, set up events appear.

  1. Go to Actions Pane, click Filter Current Log.
  2. In the Event Sources list, to select the WUSA click the checkbox, then click Ok.

Note: The .msu files can be installed through using the DISM.exe / Add-package option together to an offline image with the Windows 7 or Windows 8 the Windows Automated Installation Kit (AIK) or OEM Preinstallation Kit (OPK).

For more information, you can visit the Microsoft TechNet Website.