Microsoft Build
Learn. Connect. Code. Join us on May 25-27 and explore what’s next in tech.

Download .NET Framework 4.5.1

This release has reached end of life, meaning it is no longer supported. We recommend moving to a supported release, such as .NET Framework 4.8. See our support policy for more details.

Runtime

Do you want to run apps? The runtime includes everything you need to run existing apps/programs built with .NET Framework.

Download .NET Framework 4.5.1 Runtime

Developer Pack

Do you want to build apps? The developer pack is used by software developers to create applications that run on .NET Framework, typically using Visual Studio.

Download .NET Framework 4.5.1 Developer Pack