The Visual Studio SDK 2005 September (2005-09) Community Tech Preview is compatible* with the Visual Studio 2005 Release Candidate.

The VS SDK 2005-09 CTP can be downloaded from

* - Note that we did not do as an exhaustive test pass with that combination as we did with the VS SDK 2005-09 CTP and the Visual Studio 2005 August CTP, so there could be some minor issues that we are not aware of.