If you have one of the official TeX distribution installed, then all files are still present or can be installed by using the file manager. Otherwise save the files pst-hsb.sty|tex in a directory, which is part of your local TeX tree. Then do not forget to run texhash to update this tree. pst-hsb needs pst-plot (pstricks-add) and pstricks, which should be part of your local TeX installation, otherwise get it from a CTAN server, https://mirror.ctan.org PSTricks is PostScript Tricks, the documentation cannot be run with pdftex, use the sequence latex->dvips->ps2pdf or simply lualatex. %% This program can be redistributed and/or modified under the terms %% of the LaTeX Project Public License Distributed from CTAN archives %% in directory macros/latex/base/lppl.txt. %% $Id: README 350 2021-12-16 10:20:18Z herbert $