This directory constains bundled supplementary materials for Linear and Geometric Algebra and Vector and Geometric Calculus by Alan Macdonald:
From http://www.faculty.luther.edu/~macdonal/laga/index.html:
GAlgebraPrimer.pdf contains instructions for installing and using GAlgebra. The primer also downloads with GAlgebra.
From http://www.faculty.luther.edu/~macdonal/laga/index.html:
As of the fourth printing (of Linear and Geometric Algebra) there is a new Chapter 10 on the magical conformal model. The latest version of the chapter is also available here.