Visual Studio 2013 / Crystal Reports

We are a long time user of Crystal Reports. Now we've upgraded from Visual Studio 2010 to 2013. VS complains that it cannot find Crystal Reports when the DLLs are included in the project references.

Part of the reason for upgrading was to utilize Microsoft Framework 4.5.1 which cannot be used in the 2010 version of Visual Studios.

What options are open to me?