We recommend using FTP Client with some free ftp software, download from our download section.
FileZilla is the most popular among open source project and most of the FTP software could let you connect and send paralelle files at the same time in a plus that they could detect broken connection in the past and resume the transfer from what part or section it had been done in the past already.
So it's won't waste much of your Internet bandwidth because it continue from old transmission status, resume the file size transfer too.
