This should be very simple. Follow the above tutorial, and create a cmd.txt file that will be looking like:
- open ftp.host.com
username
password
cd folder
get file.ext c:\save\to\file.ext
quit
To know the switches of ftp.exe, open a DOS window and type
ftp -? in the command line. When you're inside the program, you can type
? to view a list of commands you can use.