On-demand install script for Windows Update clients
You can safely use the VBScript below, from any server console, it immediately downloads and installs all approved patches then reboot if required.
Set fso = CreateObject(“Scripting.FileSystemObject”)
Set objAutomaticUpdates = CreateObject(“Microsoft.Update.AutoUpdate”)
objAutomaticUpdates.EnableService
objAutomaticUpdates.DetectNow
Set objSession = CreateObject(“Microsoft.Update.Session”)
Set objSearcher = objSession.CreateUpdateSearcher()
Set objResults = objSearcher.Search(“IsInstalled=0 and Type=’Software'”)
Set colUpdates = objResults.Updates
Set objUpdatesToDownload = CreateObject(“Microsoft.Update.UpdateColl”)
intUpdateCount = 0
For i = 0 to colUpdates.Count – 1
intUpdateCount = intUpdateCount + 1
Set objUpdate = colUpdates.Item(i)
objUpdatesToDownload.Add(objUpdate)
Next
If intUpdateCount = 0 Then
WScript.Quit
Else
Set objDownloader = objSession.CreateUpdateDownloader()
objDownloader.Updates = objUpdatesToDownload
objDownloader.Download()
Set objInstaller = objSession.CreateUpdateInstaller()
objInstaller.Updates = objUpdatesToDownload
Set installationResult = objInstaller.Install()
Set objSysInfo = CreateObject(“Microsoft.Update.SystemInfo”)
If objSysInfo.RebootRequired Then
Set objWMIService = GetObject(“winmgmts:{impersonationLevel=impersonate, Shutdown)}!\\localhost\root\cimv2”)
Set colOperatingSystems = objWMIService.ExecQuery(“Select * from Win32_OperatingSystem”)
For Each objOperatingSystem in colOperatingSystems
objOperatingSystem.Reboot()
Next
End If
End If
Source : Best Practices in Architecting and Implementing Windows Server Update Services (WSUS)