Zen Cart is made available to you for your use, addition, changes, modification, etc. without charge, under Version 2 of the GNU General Public License.
While we do not charge for this software, we greatly appreciate donations to help cover the expenses of maintenance, upgrades, updates, the free support forum and the continued development of this software for your online E-Commerce store. Please consider making a donation each time you install a new version.
Donations can be made on the Zen Cart Team Page
We appreciate your support.
The Zen Cart Team
For additional help and support, visit the Zen Cart Docs and the Zen Cart Support Forum.