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Article ID: 898461 - Last Review: May 22, 2013 - Revision: 3.0

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The Package Installer for Windows is used to install software updates for Microsoft Windows operating systems and for other Microsoft products. on the computer so that subsequent software updates can have a significantly smaller download size.

More information

New features in the Package Installer for Windows version

Currently, the files for the Package Installer for Windows are downloaded every time that you use the Windows Update site or Automatic Updates to update the computer. This redundant download can be avoided if the installer files are made resident on the computer, because subsequent updates can use the resident files. Software update 898461 installs the files for the Package Installer for Windows version on the computer.

Note This change in behavior applies only to express installation packages that are downloaded from the Windows Update site or through Automatic Updates for Microsoft Windows XP. Downloads from the Windows Update Catalog site are not affected.

Update information

The files for the Package Installer for Windows are installed in the following folder:
Note The placeholder %windir% represents the location of the Windows system directory. The placeholder %lcid% represents the language identifier for the operating system that the computer is running. For more information about language identifiers, visit the following Microsoft Web site: (
The following files are installed in this folder:
  • Update.exe.ref
  • Updspapi.dll.ref
  • Spuninst.exe.ref
  • Spcustom.dll.ref
  • Spmsg.dll.ref
  • Spupdsvc.exe.ref

Effect on future updates

Software update 898461 was first offered as a critical update. However, this software update is now mandatory.

Some of the software updates that are released on or after July 26, 2005 and that are available at the Windows Update site or are available through Automatic Updates do not include the Package Installer for Windows. Instead, these updates use the permanent copy of the Package Installer for Windows that software update 898461 installs.

Software updates that were released before the release of software update 898461 will not be modified and will continue to be offered as is. Updates that are available from the Windows Update Catalog site will also continue to contain the installer and therefore will not depend on the presence of software update 898461 on the system.

Download information

The following file is available for download from the Microsoft Download Center:
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Download the 898461 package now. ( Release Date: Jun. 28, 2005

For more information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591  ( ) How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Additional resources

kbhotfixserver kbqfe kbPubTypeKC kbwindowsinstaller kbdownload kbadmin kbexpertiseadvanced atdownload kbupdate kbinfo KB898461
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