A very big THANK YOU Alexander ! My problem with FTP was a FTPES problem, this type of connection didn't exist since the new version 2.2 , I try it now with the new version and it work great !
So, thank you again !

Ps : it's not possible to download empty files from a ftp server? I try and it doesn't work...

For community information,
If the error message "weird server reply" appear, check :
- the number of ftp connection allow, you try to transfert 5 files and you allow 2 connections to your server, change to 5 or transfert 2 by 2

Me again ! ;-)
I resolve my problem, it was a configuration problem from my ftp server ! My fault , sorry ;-)
This message appear when you limit the numbers of IPs to connect to the ftp server, in my case the limit was 2, I change to 5.
Now I got a FTPS problem... In FTP mode all is good, but I cannot have a FTPS connection....
Now it's a SSL error...

LoL
This problem com from a long distance, Reunion island if you know ;-)
I send you the log in few minutes.
Hope you can resolve the problem