DXUT was primarily used to drive DirectX samples, and really that's about all it was good for -- it was itself always shipped in the samples directory of the SDK.
Modern (that is, for Windows 8) samples seem to directly include "DirectXApp" classes that drive the basic equivalent functionality that DXUT provided. I don't believe DXUT itself has survived the transition because I don't see it in the samples directory linked off of the second page you provided.
But that's fine, since it wasn't really worth using for production applications.
EDIT: However, as of September 2013, as Chuck notes above, a standalone updated to DXUT can be obtained.