How to disable password save in V1.5

Hi SmartFTP users,

I have a 2005 version (1.5)of SmartFTP, which works well. However, I recently got my live website hacked after a trojan stole my FTP password, presumably from the SmartFTP data files, and used it to upload a virus on my live site.

I can't seem to find a way to stop SmartFTP from saving the last valid FTP password for a site. Any suggestions?