Due to its large size (10.2 Mb after compression), the source archive has been split into six segments. You can FTP them from the directory /pub/AUIS/dist-6.3/ on ftp.andrew.cmu.edu, or use the following links. (If you download these with a Web client, be sure to use your Web client's option to store the files on disk rather than displaying them. In NCSA Mosaic, this is the "Load to Local Disk" menu option.)
foreach i (auis1 auis2 auis3 auis4 contrib doc) gunzip < $i.tar.Z | tar -xvf - . end
This will produce a directory tree which totals about 50 Mb. There will be a README file in the top level which contains instructions on building the system.