Silverlight Tools Installation Error Codes

[Edited to included updated Silverlight 3 Tools] 

When the Silverlight Tools fail to install, a log file is generated with error codes and messages.  You can open this log file from the last screen of the installer.  Or, you can find this log file in your %TEMP% directory under the name  Silverlight Tools RTW_ [installation date and time]. html or Silverlight 3.0 Tools_ [installation date and time] .html

failure 
Silverlight Tools Installer

webpi
Web Platform Installer

Open this log file and look at the end to find the exit code and messaging about why the installer failed.  It may say something like “Final Result: Installation failed with error code: (0x80072EE5).” or “Final Result: Installation failed with error code: (0x1), Incorrect function.”

 

Error Code Error Message Cause Fix
0x80070643 PerformOperation on exe returned exit code 1603 A newer version of the developer runtime is already installed

Manually uninstall “Microsoft Silverlight” from Add/Remove Programs and run the installer again

0x80070666 Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel. The installer failed to uninstall a previous version of the tools package Manually uninstall "Microsoft Silverlight Tools for Visual Studio 2008" from Add/Remove Programs and run the installer again
0x80070671 Update removal was disallowed by policy. The installer failed to uninstall a previous version of the Visual Studio patch Manually uninstall Silverlight Tools patches (KB967143 or KB956453) applied to Microsoft Visual Studio 2008 under Installed Updates
0x80072EE5 WinHttpConnect failed with error: 12005 The developer runtime failed to download because there is no internet connection For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools folder” and run the installer again
0x80091007 The hash value is not correct. The developer runtime failed to download correctly For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools folder” and run the installer again
0x80072EF1 Installation failed with error code: (0x80072EF1) Local admin account does not have proxy access and the developer runtime failed to download For SL2: Save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Save Silverlight_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools folder” and run the installer again
1 in WebPI Incompatible process running, unable to complete install Visual Studio or a web browser was open during installation Close Visual Studio, Visual Web Developer Express, Internet Explorer, and Firefox and run the installer again
1603 in WebPI PerformOperation on exe returned exit code 1603 A newer version of the developer runtime is already installed Manually uninstall “Microsoft Silverlight” from Add/Remove Programs and run the installer again
12005 in WebPI WinHttpConnect failed with error: 12005 The developer runtime failed to download because there is no internet connection For SL2: Manually save Silverlight.2.0_Developer.exe to the “%TEMP%/Silverlight Tools RTW” folder and run the installer again For SL3: Manually save Silverlight_Developer.exe to the “%TEMP%/Silverlight 3.0 Tools folder” and run the installer again