Thomas,
All good questions and I will attempt to answer them if I can figure out where I saw things since I was floundering around all over the place trying to find my own answers and ended up with very many windows open.
The file PDFsharp-Help-Standalone-1_31.zip has 2 files in it. PDFsharp and MigraDoc Documentation.chm has a table of contents, but no details. The file !ReadMe.txt has all kind of links in it, but I don't see any comments about unblocking it. However, following assorted links did get me to
http://www.nudoq.org/#!/Projects/PDFsharp-MigraDoc-GDI which seems to be some basic documentation and I did notice that there was a download link and downloaded it. Unfortunately, the download link does not seem any better than the online version.
The file PDFsharp-Help-VSIPCC-1_31.zip has 3 files, setup.exe, PDFsharp and MigraDoc Documentation.msi, and !ReadMe.txt. I did run setup. The !ReadMe.txt file only has the word TODO in it. However, I do see from the other !ReadMe.txt file for the standalone help that this help is only supposed to work with Visual Studio 2008 or 2005 and I have 2012.
Unfortunately, I cannot find the link to the unanswered question, but I seem to recall that it was not at pdfsharp.net. It might have been at the sourcforge discussion, but I cannot find it now.
So that brings me up to the present. Is the nudoq.org help as good as it gets or is there a better source? Is there something that I can do to the .chm file to make it yield useful information? Thanks again.