I use XP and WinHTTrack 3.38-13

I have made a copy of a website with defaults parameters, the only restriction
is: -* +website.fr/*, but images are missing:

"Warning:  Unexpected 412/416 error (Requested Range Not Satisfiable) for
website.fr/folder/image-054.jpg etc. could not be found on disk"

I have the folder, there are image-001 to image-100 but some are missing, for
example image-054 that is rename as image-054.html

There are about 2000 missings images in differents folders that are on my
hard-drive. I've tried to open some with the link in a browser: they are on
the website.

I don't speak very well english, I have found some threads about 412/416 in
this forum, but I don't undertand enough the answers. If the question is
allready in this forum, what are the keywords to find it?
What can I do to get this missing images?For the next time: what can I do to
not have this errors?
Thank you