Microsoft Silverlight

This is a silent installer for Microsoft Silverlight, a plugin for rich interactive web content, in some extent similar to Macromedia Flash Player.

You can check for the latest version at http://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx

Silverlight 5

<?xml version="1.0" encoding="UTF-8"?>
<package
  id="silverlight"
  name="Microsoft Silverlight"
  revision="%version%"
  reboot="false">
 
  <variable name="version" value="5.1.10411.0" />
 
  <check
    type="uninstall"
    condition="versiongreaterorequal"
    path="Microsoft Silverlight"
    value="%version%" />
 
  <install cmd='"%SOFTWARE%\silverlight\Silverlight-%version%.exe" /q /noupdate' />
  <upgrade include="install" />
  <remove cmd='msiexec /qn /x{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}' />
</package>

Silverlight 4

<package
  id="silverlight"
  name="Microsoft Silver Light 4"
  revision="%version%"
  reboot="false"
  priority="50">
  
  <variable name="version" value="4.0.60531.0" />
	
  <check
    type="uninstall"
    condition="versionequalto"
    path="Microsoft Silverlight"
    value="%version%" />
		
  <install cmd='"%SOFTWARE%\silverlight\Silverlight-%version%.exe" /q /noupdate' />
  <upgrade cmd='"%SOFTWARE%\silverlight\Silverlight-%version%.exe" /q /noupdate' />
  <remove cmd='msiexec /qn /x{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}' />
</package>

Silverlight 3

<package id="silverlight3" name="SilverLight 3 with auto-update check disabled" revision="1" reboot="false" priority="0">
        <check  type='file' condition='versionequalto' path='%PROGRAMFILES%\Microsoft Silverlight\sllauncher.exe' value='3.0.50106.0' />
        <install cmd='"%SOFTWARE%\silverlight3\SilverLight.exe" /q /noupdate /ignorewarnings' />
        <upgrade cmd='"%SOFTWARE%\silverlight3\SilverLight.exe" /q /noupdate /ignorewarnings' />
        <remove  cmd='MsiExec.exe /qn /X{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}' />
</package>

Please notice how check has to be performed on an executable since the uninstall string seems to always be "Microsoft Silverlight" despite the version. Also notice that uninstallation GUID seems to always be {89F4137D-6C26-4A84-BDB8-2E5A4BB71E00} despite the version.

Some documentation on Silveright installation switches: http://blogs.technet.com/extreme/archive/2009/04/02/silverlight-installation-switches.aspx.

The "/noupdate" installation switch seems to set the "HKEY_LOCAL_MACHINE\Software\Microsoft\Silverlight" "UpdateMode" to DWORD value "2".

Silverlight 2

<package
    id="silverlight"
    name="SilverLight"
    revision="1"
    reboot="false"
    priority="0">
        <check type="uninstall" condition="exists" path="Microsoft Silverlight" />
        <install cmd='"%SOFTWARE%\silverlight\SilverLight 2.0.exe" /q' />
        <upgrade cmd='"%SOFTWARE%\silverlight\SilverLight 2.0.exe" /q' />
        <remove cmd='MsiExec.exe /X{89F4137D-6C26-4A84-BDB8-2E5A4BB71E00}' />
</package>

Silverlight install sometimes (always for some) exits with strange error codes (and says that it has done a rollback), yet the plugin is working fine after such fiasco.