ftplib strange behaviour

[Kartic]

PiErre,

I have used ftplib but never for such a huge file (assuming your
problem is related to the size of the file).

Have you tried downloading the file using another ftp client? Does that
download succeed? The reason I ask is because I have attempted
downloads from servers that terminate the connection after a certain
connection time, in the middle of a download!

That is the best I can help you out with the information.
Have a happy New Year.

Thanks,
--Kartic