I am trying to mirror a site with a large number of pdf files in one directory.
All of the files get retrieved less than their full size with the following
error in hts-log.txt:

13:45:06        Warning:        file not stored in cache due to bogus state
(broken size, expected 6593781 got 1095812)

[with all different sizes, once for each file]
I am using httrack 3.48-24 on Debian, and using options
httrack -B -s0

Using a browser is able to retrieve and open each pdf file.