Assuming you have a valid installation, licensing, etc, there should be a directory of PDFs somewhere in there. Among those is (if it is like what I saw years ago) "index.pdx". This is a compiled index across the doc suite, and opens in Acrobat. (Possibly also equivalent PDF readers, though some of them don't handle the search correctly.) The links there should take you to the correct general area.
To locate the directory with the PDFs on a Unix system, you can use the find command: find . -name "*.pdf"
This will give you the full path of all PDF files below the directory you are in. (If you are desperate enough to kick it off from /, try find . -name index.pdx instead, and hope they haven't renamed the index file in the past decade.)