I would think that the PDF file is it probably quite out of date now, and that other NConvert information available on the forum probably contains much the same or even identical information.
The NConvert help file for the current version that can be created from the terminal contains much of the information needed to use the utility.
Are you using NConvert, and do you have particular questions?
Thanks for the suggestion, no questions yet. It would just be interesting to read this pdf in case I missed something. Or, if it's not on the server, it's probably better to remove the link to it, so visitors don't get an error.