Problem: The installation of Windows Phone Developer Tools (WPDT) will fail if you have previously installed the latest update of Silverlight 4, which was published to Microsoft Update on Thursday 6/3, versioned 4.0.50524.0. This failure occurs when
WPDT setup attempts to install Silverlight 4.
WPDT Versions Impacted: April CTP and April CTP refresh
How to work around the issue: If you run into this error while trying to install latest WPDT , you can solve it by doing the following:
Go to the Programs and Feature control panel.
Locate the item named Microsoft Silverlight and uninstall it.
Re-run WPDT setup.
This issue will be addressed in a future release of the Windows Phone Developer Tools.
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