In the former case one first unzips with the UNIX command
the UNIX command
This will create a directory
tar xvf heckesource.tar
hecke(with contents) in your current directory. If you are not on UNIX, you will have trouble with these programs anyway. If you are on UNIX, but not on a SUN, you may try standardized programs instead. Or, if you want the latest, try experimental programs instead.