There is an ambiguity in the httrack Guide by Fred Cohen.

<https://www.httrack.com/html/fcguide.html>

Under the section titled "Some More Examples," the first example listed is:

httrack "www.website.com/" -O "/tmp/www.website.com" -R5H0Ko0s0zZd %H -V "md5
\$0" "+*.website.com/*"

Note that there is no "Ko0" option - since the author was being explicit as to
the options (including default options), he probably meant to write "K0o0" as
evidenced by his explanation of these options:

"[R5] It uses 5 retries to be more certain than normal of getting the files,
[H0] never abandons its efforts, [K0] keeps original links, [o0] does not
generate error
files, [s0] ignores site restrictions for robots, [z] logs as much as it can,
[d] stays in the principal domain, [Z] places debugging headers in the log
file"

Note also that the explanation should have [z] followed by [Z], and then [d],
since the arg line is "...zZd" and not "...zdZ"

I hope this clarification helps someone else.