Previously released versions of the code are available, but it is recommended to use the most recent version.
The current version 4.2 of the GPML code is available here.
Changes between versions are documented here.
The version 4.2 dated 2018-06-11 is available as tar.gz, zip and from gitlab.
The version 4.1 dated 2017-10-19 is available as tar.gz, zip and from gitlab.
The version 4.0 dated 2016-10-19 is available as tar.gz, zip and from gitlab.
The version 3.6 dated 2015-07-07 is available as tar.gz, zip and from gitlab.
The version 3.5 dated 2014-12-08 is available as tar.gz, zip and from gitlab.
The version 3.4 dated 2013-11-11 is available as tar.gz, zip and from gitlab.
The version 3.3 dated 2013-10-19 is available as tar.gz, zip and from gitlab.
The version 3.2 dated 2013-01-15 is available as tar.gz, zip and from gitlab.
The version 3.1 dated 2010-09-27 is available as tar.gz, zip and from gitlab.
The version 3.0 dated 2010-07-23 is available as tar.gz, zip and from gitlab.
The version 2.0 dated 2007-06-25 is available as tar.gz, zip and from gitlab.
The version 1.3 dated 2006-09-08 is available as tar.gz, zip and from gitlab.