> “twiki/pub/SIG” sub-directories.  I only want to
> copy links and data within the “twiki/bin/view/SIG”
> directory, “twiki/pub/SIG” directory, and
> “twiki/pub/SIG” sub-directories.
If your browser can read those directories so can HTT.
Otherwise, it can only get those files referenced (recursively) from your
starting url.

> is the “twiki/pub/SIG/YYYYYPreviousVersions/*.pdf”
> files are being interpreted as external files and
> are not copied.  
Based on what you have said, the filters should be correct.

Always post the actual command line use (log file line two) not what you think
you did.
Does the log file mentioned robots.txt
Post the url of the page referencing the pdf.