From your PC or host machine, run the ftp program. A typical session is shown below with expected responses bolded.
>ftp ftp.ciesin.org
login: ftp
password: <your e-mail address> do not type the < > marks
ftp> cd holdings/data_sets/100628.aids/dos
ftp> Binary
Type should be set to "I"
ftp> get readme.1st
ftp> get aidsnet.exe
ftp> quit or bye