New Post: Installing Casablanca SDK in Visual Studio 2013

I am facing issue while installing Casablanca SDK with latest version of Visual Studio 2013
I recently installed Visual Studio 2013 and the latest NuGet Package Manager.

1) The old MSI Installer of Casablanca SDK doesn't work here.
2) I went through this tutorial to install Casablanca SDK using NuGet Package.
https://www.nuget.org/packages/cpprestsdk/

For that I wrote this command in NuGet Package Manager console.

PM> Install-Package cpprestsdk 

But I received these errors.

The source at nuget.org [https://www.nuget.org/api/v2/] is unreachable. Falling back to NuGet Local Cache at C:\Users\User\AppData\Local\NuGet\Cache
Install-Package : Unable to find package 'cpprestsdk'.
At line:1 char:16
+ Install-Package <<<<  cpprestsdk 
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

What should I do?