The original post has my command line but most recently tried it with these
options:
/usr/local/bin/httrack allconcrete.squarespace.com -A100000 -p3 -R9
Same results!
I am not familiar with any internal processing by HTTrack.  I can see that
HTTrack is able to get a file that I am looking for except that HTTrack
creates a file with .tmp on the end of the filename.  I would expect that
HTTrack would move the temp file to the correct name when it is finished but I
end up with neither the .jpg.tmp nor the .jpg

This same behavior of saving neither the .jpg or the .jpg.tmp is all of a
sudden happening to numerous files.

The actual file I am looking for is:
<http://allconcrete.squarespace.com/storage/other/bollards.jpg> which is
accessable in a browser.

I search through the vast log file and found:
10:28:48        Error:  "Error attempting to solve status 206 (partial file)"
(-5) after 2 retries at link
allconcrete.squarespace.com/storage/other/bollards.jpg (from
allconcrete.squarespace.com/concrete-site-work/)

I have retryed HTTrack and get consistant 206 errors on the sames files even
though that are visable in browsers.