bbPress.org

I highly recommend people learn how to install bbPress (and wordpress) via SVN, it makes life incredibly easy. You can switch between bbPress versions in a heartbeat, test new betas or jump back to the previous version effortlessly.

See this topic for more info:

https://bbpress.org/forums/topic/svn-procedure-for-checking-out-bbpress

and my note at the end on how to install SVN as a simple client instead of the whole darn thing.