Yes you can download old versions through the svn or trac, which will work correctly for anything up to 0.9.0.2 (this technique won’t work on the trunk because of backpress).
I’m not sure why you’d want an old version because many plugins won’t work properly in any any case:
0.7.x: https://trac.bbpress.org/changeset/1606/branches/0.7?old_path=%2F&format=zip
0.8.x https://trac.bbpress.org/changeset/1606/branches/0.8?old_path=%2F&format=zip
0.9.x https://trac.bbpress.org/changeset/1606/branches/0.9?old_path=%2F&format=zip
or use the ZIP link at the bottom of any of these specific versions: https://trac.bbpress.org/browser/tags
Thanks for that info, _ck_.
FYI, I recently had to use .9.0.3 to get around the PHP5 issue with .9.0.4, as an example of why someone would use an older version.
.9.0.4 works fine with php4, unless you are having that mcbs problem (which is fixed in the next upcoming version, or you could get the 0.9 branch from TRAC)
Yes, it was the MCBS problem, _ck_.
Great news on the RC1 release!
