We recomment the following free FTP clients for windows and mac:

WIN XP: FileZilla FTP client (official website)
download free FileZilla here.
Install and open FileZilla.
type the following information:
Address: www.bangertverlag.de l User: p40723226-guest l Password: bangert l Port: 21
and click Quickconnect

Mac OSX: Cyberduck FTP client (official website)
download free Cyberduck here
Open Cyberduck.dmg and run Cyberduck.
click Open Connection and type the following information:
Server: www.bangertverlag.de l Username: p40723226-guest l Password: bangert
and ckick Connect.