The latest version of bbPress is 2.5.14, released on September 12, 2017, and requires WordPress 4.7.
bbPress 2.6 Release Candidate 5
The upcoming version 2.6 of bbPress is coming soon, we’ve released a new release candidate for testing.
To contribute to bbPress development, check-out the most recent revision from our Subversion repository.
svn co https://bbpress.svn.wordpress.org/trunk/
Download the latest development version, which is exactly what we run here at bbpress.org:
For older versions of bbPress (before 2.0) visit the legacy downloads page.