Robust FTP Client - Version 2.1 Transer files with this FTP client for both advanced Web developers and novice users. RobustFTP is a FTP client for Windows that lets you update a Web site with a single click and resume interrupted downloads or uploads. It features an Explorer-like interface that is fully customizable and supports drag-and-drop functions. RobustFTP is easy for beginners to use and has enough features to be useful to power users as well.