The codes are available by anonymous ftp from
ftp.caam.rice.edu
or by connecting directly to the URL
http://www.caam.rice.edu/software/ARPACK
To get the software by anonymous ftp, connect by ftp to ftp.caam.rice.edu and login as anonymous. Then change directories to
software/ARPACK
or connect directly to the URL as described above
and follow the instructions in the README file in that
directory.
The ARPACK software is also available from Netlib
in the directory ScaLAPACK.