Htrrack acts like an offline browser.
If you change the User Agent, do not ask for robots.txt and limit the tranfers
to the slowest possible, you may appear like a regular user.
However, humans do not browse a site like a robot (they load 1 to 5 pages,
then come back later and do not explore each link...). Thus any webmaster will
spot the unusual behaviour, will be warned if you fall in a bot traps, if you
download too many pages ...