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Requirements on the main page
On the requirement list, shows you need:
Visual Studio 2008 SP1 or Visual Web Developer Express 2008 SP1 and .NET 3.5 SP1
Silverlight 3.0 Tools for Visual Studio
When should be
Visual Studio 2010 or Visual Web Developer Express 2010 and .NET 3.5 SP1
Silverlight 4.0 Tools for Visual Studio