> If I want to shut down the pc but the download is
> not complete, can I choose 'pause' and the next time
> I power up the pc, choose 'resume'? Will I lose
> previously downloaded files?> 
> Since I'm shutting down the pc anyway, does it make
> any difference if I choose 'cancel' instead of
> 'pause'? 
> 
> Also, can I just shut down my pc without pausing or
> cancelling or even exiting HTTrack at all?
Shutting down is like pressing cancel twice. stops it dead. Links are not
update, mirror is broken.

Cancel/Continue is broken for updates, works fine on the initial download. On
update the cache is lost and all not downloaded/update files will be
redownloaded.

Pause/Resume works but you can not kill the program (shutdown would kill it.)

Just pause/Hibernate/resume. No need for shutdown.