Contributed By: Cliff Hobbs [MVP SMS]
Reproduced from the Microsoft Software Update Services: Frequently Asked Questions web page:

http://www.microsoft.com/windowsserversystem/sus/susfaq.mspx#top

"Click the links below to download the SUS components:

• Server component - Microsoft SUS (SUS10SP1.exe)
• Client component - Automatic Updates (wuau22*.msi)
  Note: The client component download is only required for Windows 2000 SP2 and Windows XP RTM. The client component is included with Windows 2000 SP3 or later, Windows XP SP1 or later, and Windows Server 2003.
• Group Policy component (wuau.adm administrative template)"