There is a new version of Sandcastle at
http://sandcastlestyles.codeplex.com/This is a free tool for producing help files from the XML documentation within C# or VB.NET code.
This is a guided installer that prompts you to install the correct components in the correct order.
The reason why the download is at http://sandcastlestyles.codeplex.com/ instead of http://sandcastle.codeplex.com/releases/view/47665 is discussed at
http://sandcastle.codeplex.com/discussions/288079