Error while installing silverlight 5 package in windows phone 8

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i'm having an error while installing silverlight 5 toolkit saying that "This installation package couldn't be opened contact the application vendor to verify that is a valid windows installer package"

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Kulasangar On

Try uninstalling the current Silverlight version and follow the steps here, which provides a work around for this issue. Or else try doing a cleanup a broken `Silverlight. installation.

clean up a broken Silverlight installation