To use the package you need the files below. Download them and put them in a directory that you name GrafPack where Mathematica can see it. Alternatively you can download the entire directory in the file grafpack.tar.gz. Start up Mathematica and type
<<GrafPack`Master`

Basics
Combinatorics
GraphFamilies
GraphIO
GraphPolynomials
TransferMatrices
Master
grafpack.tar.gz

Other packages:

Smooth.m A package containing routines for data smoothing using a Savitzky-Golay filter.

Kasteleyn.m A package implementing Kasteleyn's formulas for the number of 1-factors (perfect matchings) in square lattices (planar, cylindrical, toroidal).

Beale.m A package implementing Beale's method for computing the Ising partition function of toroidal square lattices.

Convert.m A package for manipulating graph polynomials, such as matching, Ising and Van der Waerden polynomials.

Boltzmann.m A package for converting entropy derivatives into Boltzmann distributions, and some other tools for statistics. Updated to work with Mathematica version 8.