To be a little more precise:
It is not an obscure bug, these problems are repeatedly reported since years.
Seems this is related:
Somewhere in the forum someone even supplied log and debug files and partially
worked out what happens.
Regarding misconfigured servers: Server settings (usually) are out my control.
If my browser can download things httrack should also do.
BTW: In my testing case, it is my own server running on a VM (Debian apache2
out of the box).
Program version 3.32 works and 3.33 does not. This looks like a typical
A download with ~15% files "corrupted" is a severe program malfunction.