A website (web server) is NOT equivalent to a a FTP server. The FTP protocol (used for file transfer) is quite different to the HTTP protocol (used to deliver web pages).
Unless you’ve got a FTP server running at your hosted domain, you’re not going to get past first base. Investigate your hosting setup, and try manually downloading the file using a FTP client (like the command line FTP client - ftp - in Windows, or one of the many GUI based clients).
Once you can manually download the file using FTP, then you can determine the parameters required for the DOTA FTP process.