This is a continuation
#2010 which was about the thorn guide being missing. This one is about the link behind "Thorn Guide" on http://einsteintoolkit.org/documentation.html, namely http://einsteintoolkit.org/thornguide/ points to an auto-generated index page of a directory of pdf files. Instead of the correct HTML page for a table of content pointing to html pages of documentation.
Likely requires web server access to fix.