Using Visual Studio 2013 Professional, using the web platform installer I select Microsoft Azure SDK for .NET (VS 2013) - 2.5.1.
I add and click install.
The next screen tells me what it's installing, showing 0MB in terms of size.
The operation finishes, however I create the new project and here is what I see.
When I go back to the web platform installer, it indicated 2.5.1 sdk was not installed.