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Fast Downward Releases
Fast Downward uses time-based version numbers of the form YY.MM. For example, Fast Downward 19.06 was originally released in June 2019. We follow an annual release cycle, but exceptions are possible. Bugfix releases are numbered as 19.06.1, 19.06.2 and so on.
Fast Downward is research software, and we do not provide extensive support for past releases. In particular, we generally do not backport bug fixes. Bug fix releases are intended to be a rare exception to address critical problems that can be backported with reasonable effort, such as incompatibilities with new compiler versions. Bug fix releases are generally limited to the latest release series.
Releases since 2019
Fast Downward has been in development since 2003, but we only started using the current release model in 2019. Some very old planner versions from are available in a repository of historical Fast Downward versions.
From 2008 onwards, various versions of Fast Downward and related planners were released as part of the International Planning Competition series.