> <http://www.windoweb.it/desktop_temi/foto_fiori/>
> 
> but I can only download one file at a time, for
> example:
> <http://www.windoweb.it/desktop_temi/foto_fiori/foto>_
> fiori_01.JPG
> 
> 00:53:55 Error:  "Forbidden" (403) at link
> www.windoweb.it/desktop_temi/foto_fiori/ (from
What part of forbidden don't you understand? You can't read that directory,
neither can httrack.

Either you have to spider the site to get the image url's
or you have to guess at them
Number sequences: How to mirror only files/URLs using a certain ID/number
range - <http://httrack.kauler.com/help/URL_number_sequences>