What to do if you can’t run 1.0 apps after installing 1.1 and/or VS 2008?

It is possible, with the new release of Visual Studio, to find that you can no longer run 1.0 applications. Here is the scenario:

  1. You install Visual Studio 2008 (RTM)
  2. You install Silverlight 1.1
  3. You create and run a Silverlight 1.0 application and it asks you to install Silverlight 1.0 saying you have a more advanced copy. When you try, it refuses, and the message won't go away.

Argh. (oh, the video we offer to show you how to uninstall on Vista is broken, so don't bother!)

The fix, fortunately, is quite easy.

  1. Open control panel
  2. Navigate to Programs and Features.
  3. Scroll down to Microsoft Silverlight (under "M")
  4. Click on and highlight Microsoft Silverlight
  5. Click on Uninstall.

Once it is uninstalled, go to the Showcase page on Silverlight.net and you'll see a box on the left offering to install Silverlight 1.0. Click Install Now and then choose Run. (You may have to give permission to "run Active-X control).

Hey! Presto! Fixed.

I apologize for this inconvenience.

About Jesse Liberty

Jesse Liberty has three decades of experience writing and delivering software projects and is the author of 2 dozen books and a couple dozen Pluralsight & LinkedIn Learning courses. He was a Senior Technical Evangelist for Microsoft, a Distinguished Software Engineer for AT&T, a VP for Information Services for Citibank and a Software Architect for PBS. He is a Xamarin Certified Mobile Developer and a Xamarin MVP and a Microsoft MVP.
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