Installing Silverlight 4 Beta


If you are getting an install error while trying to install Silverlight 4 Beta on an existing machine with Silverlight 3 SDK installed, please verify that your Silverlight 3 SDK version is 3.0.40818.0.

If you have an older version installed, you can uninstall it and reinstall a newer version here.

Hope this helps.

Phong Hoang
ImageSource, Inc.

2 thoughts on “Installing Silverlight 4 Beta

  1. Hey, I came across this blog post while looking for help with Microsoft Silverlight. I’ve recently changed browsers from Opera to IE. After the change I seem to have a problem with loading websites that have Microsoft Silverlight. Every time I browse site that requires Microsoft Silverlight, my browser doesn’t load and I get a “npctrl.dll” error. I cannot seem to find out how to fix the problem. Any aid getting Microsoft Silverlight to work is greatly appreciated! Thanks

    • There are two things you could try:

      1) Register npctrl.dll by running regsvr32 “C:\Program Files\Microsoft Silverlight\\npctrl.dll” from a command-line window.

      2) If that step 1 did not work, your problem is probably in one of the IE add-ons. A helpful tip is to start disabling all add-ons and re-enable them at a time to find the bad one.

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