Download Microsoft .NET Framework 4.5 from Official Microsoft …
https://www.microsoft.com/en-us/download/details.aspx?id=30653
WebThe .NET Framework 4.5 adds substantial improvements to other functional areas such as ASP.NET, Managed Extensibility Framework, Windows Communication Foundation, Windows Workflow Foundation, and Windows Identity Foundation. The .NET Framework 4.5 delivers better performance, reliability, and security.
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