The only way to get these fastq files through FTP, is to use each individual files location, since they are in different directories based on their accession number.
Option 1: Not FTP based. Click on "Bulk download files" button on the page you linked. Allow Java app to run. Select all files .. download.
Option 2: Click on "TEXT" button to download a listing of all the files. There are multiple columns in the file, some of which contain FTP location links. Use the links under fastq_ftp for FTP in batch. Couple of example lines below.
The only way to get these fastq files through FTP, is to use each individual files location, since they are in different directories based on their accession number.