Herbert Voss uploaded a TDS (TeX directory structure) compatible tarball which you can use to update your complete PSTricks packages in an easy way. If you have a running system, never change it. The file is about 50MB.
You can obtain the files from here Or alternatively from here.
the structure is:
texmf-> (texmf-dist for texlive)
doc
dvips
tex
generic
latex
after installing – which is only copying all files -, run texhash for updating your database.