> I want to download this site :
> <http://jacxl.free.fr/cours_xl/cadres.html>
> but it is not completely downloaded....

Which files are missing? You may user filters (such as 
+*.wav or +*.zip).
Note that this site is hosted by free.fr, which can detect 
(and exclude) the Browser-ID string sent by HTTrack (this 
was done because some users abused the bandwidth, and 
ogliged free to exclude common robots/spiders). Try to ask 
first the permission to copy the site, change the browser-
ID settings (Set Options/Browser ID/Browser identity) *AND* 
set *reasonnable* settings for the mirror: 2 simultaneous 
connections, and bandwidth limit if you are connecting 
through a fast pipe (8KB/s is a godd setting). DO NOT use 
numerous simultaneous connection, and DO NOT use fast 
pipe ; it is always better to take the time to mirror, 
instead of clobbering a site.