Microsoft has released Update 4.0.2 for Microsoft .NET Framework 4: Runtime Update

This is Update 4.0.2 for Microsoft .NET Framework 4 containing a set of new features addressing top customer feature requests and important .NET Framework scenarios.

Update 4.0.2 for Microsoft .NET Framework 4 is now available. This update contains some new features that are based on specific requests from some top customer and on some important .NET Framework scenarios. This update also contains some important software updates for ClickOnce and for .NET Framework 4-based Windows Presentation Foundation (WPF) applications.

Notes
This update release updates only the runtime files for the Microsoft .NET Framework 4. For more information about the details of this update, see the "More Information" section.
This update contains all the runtime changes from the following update:
2478063 Update 4.0.1 for Microsoft .NET Framework 4 - Runtime Update
Therefore, this update is a cumulative update. Any application built for the .NET Framework 4.01 can run on a computer that has the .NET Framework 4 and the Update 4.0.2 runtime installed. We recommend that applications built for the Microsoft .NET Framework 4.0.1 be upgraded to the Update 4.0.2 runtime. However, this upgrade is optional.
We do not support any application that this update was used to build on any prerelease version of the .NET Framework 4 such as a Beta. Additionally, we recommend that any such application be upgraded to at least the Microsoft .NET Framework 4 RTM.

  Update 4.0.2 for Microsoft .NET Framework 4: Runtime Update (KB2544514)