Download GPL

Older versions of Concepts (excluding BEM) are available under GNU General Public License:

• 2006-04-18: Release 2.1.1 is available: concepts-2.1.1.patch.gz (15k).
• 2004-09-17: Release 2.1.0 is available: concepts-2.1.0.tar.gz (2.0M), ChangeLog.
• 2004-06-10: The initial public release of Concepts is version 2.0.0: concepts-2.0.0.tar.gz (1.8M).

However, note that support of these versions is not provided anymore and using the developing version is highly recommended!