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One of the most popular FTP clients available for free is FileZillaCuteFTP. This quality open source FTP client is downloadable from httphttps://filezilla-project.org/ installer.globalscape.com/pub/cuteftp/cuteftp.exe
The screen shot below shows the proper configuration in the FileZilla the CuteFTP site manager for accessing the UltraCart FTP server.
(Please NOTE: A previously recommended FTP client, Filezilla, is no longer recommend due to issues with malware that is inserted from some file download repositories.)
You can use the FTPS with TLS/SSL (AUTH TLS Explicit) option within CuteFTP.
The other field highlighted on the configuration screen is the server type. The UltraCart FTP server supports FTPES (FTP over explicit TLS/SSL). If this option is available, UltraCart recommends using it because the FTP control port used to transmit the username and password will be encrypted making the communication very secure.
While a complete tutorial on how to use FTP or FileZilla in CuteFTP in particular is out of the scope of this guide, below is a brief explanation of the windows. Notice the client is divided into two sides "Local site" and "Remote site". The remote site represents the UltraCart FTP server. 
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