Download Microsoft Pre-Release Software Microsoft . NET Framework 3.0 - Release Candidate from Official Microsoft Download Center.
A specific minor build number of the .NET runtime. How to Install Windows Workflow Foundation download+install+windows+workflow+foundation+version+3042032
If your version of WF is part of the OS but not activated: Download Microsoft Pre-Release Software Microsoft
To install Windows Workflow Foundation (WF) , you generally don't download a standalone installer for the engine itself, as it is a built-in component of the .NET Framework download+install+windows+workflow+foundation+version+3042032