If you installed Visual Studio 2012 (any edition) on your target machine or you’re running Windows
8 or Windows Server 2012, you already have the .NET Framework 4.5 installed. Otherwise, you
need to download it. You can use the Web Platform Installer as discussed earlier, or you can download
the redistributable package from the Microsoft site at http://msdn.microsoft.com/en-us/
netframework. Follow the Download or Install link or use the search option and search for “download
.NET Framework 4.5.” Make sure you download the full version of the .NET 4.5 Framework
and not an earlier version or the Client Profile package. After you have downloaded the .NET
Framework, run the installer and follow the on-screen instructions.