Crystal 2013 does not include the SDK. Instead, you can download it for free from here:
SAP Crystal Reports, developer version for Microsoft Visual Studio: Updates & Runtime Downloads
Use the latest version of the "Install Executable" for integration with Visual Studio. The other downloads are various types of runtime installs that you can use when deploying your application.
This version of the SDK only works with VS 2010 or newer. It also does not "play well" when installed side-by-side with an older version of the SDK, so you'll need to uninstall the Crystal 2008 SDK in order to develop with the new Crystal for Visual Studio SDK.
Neither of the CrystalReports.Enterprise assemblies are included in the SDK - you can just remove them from your project.
All of the rest of the files should be there.
-Dell