First do the following:

• Copy the file ./SETPATH/setpath.m into your working directory and modify it.
• Run setpath to have access to SeismicLab codes, data and demos.
• Good luck!

The old SeismicLab software from 1997 was written to provide examples to undergraduates taking my courses. The old repository is here — http://seismic-lab.physics.ualberta.ca/ — but it is not mantained anymore. So if you want to use SeismicLab, please download this version from GitHub.