With the latest update of
our NuGet package (1.1.1), you will notice that the package will no longer install in projects targeting Windows Phone 7.5. The change is due to our shift to newer tooling, which drops support for that platform. The tooling update is necessary so our package
can support the latest versions of Windows and Windows Phone going forward.
If you still need support for Windows Phone 7.5, you can always install an older version of our NuGet package, by running the following command in the Package Manager Console: