> Hello, is there anyway I can make httrack retry a
> file download if it previosly encountered a 404
> error (which is basically some sort of protection
> against robots)? As far as I know, httrack considers
> 404 errors as fatal ones and it does not retry
> them....

The server states that the file does not exist.  Asking again will not change
that.  

If the file actually exists (your browser can see it) then fix the problem in
httrack and try an Update.

> If this cannot be done, can someone please point me
> to the right direction in the httrack sources (the
> place where I can make this changes)....

All you want is to create a denial of service attack.