• Creator to initiate process.
• FTPCaller to list items.
  • Set username & password in Authentication. FTP link in URL.
• Parse link to file you need. Something like ftp://download.me.com/file.txt
• FTPCaller to download item.

Thank you so much for your response. would you mind explain more about how to do list item part? and what should I do for last two steps?
I really appreciate your assistance

How do I download all the zip files in the directory from an FTP site?

This is a bit annoying to do, the response from a request to a directory with the FTPCaller is a file list. 

The file list needs to be split up into features to make subsequent requests for every file. There is a CustomTransformer on the FME hub called S(FTP)-2-Features which looks like has been put together to split up the request into a list of features. I haven’t tested it but I would definitly try that. 

Once you have your list of features then you can pass them into another FTPCaller to download the files.