The CTIO package is available from the IRAF network archive. Since this is a layered package on IRAF you must have a running IRAF system before you can install this package.
% ftp iraf.noao.edu ftp> log in as anonymous ftp> use your email address as the password ftp> cd iraf/extern ftp> binary ftp> get ctio.readme ftp> get ctio.tar.Z ftp> quit
Installation questions can be directed to the appropriate forum.
