When you download the .NET Interface, you receive one file:
Unzip the file CGC.CC-API.zip and include CGC.CC-API.dll as a reference in your Visual Studio C# project.
There are three build versions of CC-API .NET Interface in CGC.CC-API.zip: AnyCPU, x86 and x64.
You can find examples of how to use .NET Interface on code snippets page.
In case you lost all your e-mails, you can also retrieve the files and the license keys on “My Account“.