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I was setting my developerment environment yesterday after upgraded to Windows 8.1. While I was installing Windows Phone SDK. I got the above error. And it seems the cause of this error is invalid digital certificate. I searched through the internet and found a way to resolve it.

Here are the steps

  1. Uninstall partially install WP8 SDK.
  2. Download the following links (download all 4)
  • Save the above downloaded files to the same directory where we can see WPexpress_full.exe (or any WP SDK installation file)
  • Click and install Win8SharedSDKTools.msi file.
  • After installing Win8SharedSDKTools.msi, re-run Windows Phone SDK 8.0 setup and install like normal.
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