Hi Xavier
your software is really amazing , I am the physician ,I 
tried many times with the invisible frame that yuo said to 
and I finally succeed , so I succed to copy some PDF files 
and some HTMl files but most of the files are not copied 
on the disk (copied but they are empty )with a message 
like tha :Host: ipsapp003.lwwonline.com
File: /content/getfile/2420/16/9/abstract.htm
Name: C:/Mes Sites 
Web/PRS/ipsapp003.lwwonline.com/content/getfile/2420/16/9/a
bstract.htm
ContentType: text/html
StatusCode: 200 (OK)
InternalStatus: 1 (receiving)
StatusMessage: OK
HTTP/1.1: no
ChunkMode: no
TestMode: no
HeadRequest: no
NotModified: no
WriteToDisk: no
LocalFile: no
Size: 2653
TotalSize: -1
 

or like that :
Host: ipsapp003.lwwonline.com
File: /content/getfile/2420/1/8/fulltext.pdf
Name: C:/Mes Sites 
Web/PRS/ipsapp003.lwwonline.com/content/getfile/2420/1/8/fu
lltext.pdf
MoveToLocation: 
<http://ipsapp005.lwwonline.com/IPS_ECOM/SilverStream/Pages/>
pgLogBuy.html?J=2420&I=1&A=8&U=1&T=2&nexturl=http%3A%2F%
2Fipsapp003.lwwonline.com%2Fcontent%2Fgetfile%2F2420%2F1%
2F8%2Ffulltext.pdf
ContentType: text/html
StatusCode: 302 (Moved Temporarily)
InternalStatus: 0 (ready)
StatusMessage: Moved Temporarily
HTTP/1.1: yes
ChunkMode: no
TestMode: no
HeadRequest: no
NotModified: no
WriteToDisk: no
LocalFile: no
Size: 499
 
so may be you find me a solution .
But even you don't find a solution ,your HTTRACK still 
amazing and unbelivble.I think with perfections you'll be 
next BILL GATES