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, donations are greatly appreciated, each time you install a new version, 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.
Donations can be made on the Zen Cart Team Page
We appreciate your support.
The Zen Cart Team
For up-to-date requirements, see: Zen Cart Server Requirements.
While Zen Cart can run on Windows/IIS servers, Linux/Apache servers are recommended for best results.
Before you make a decision about which upgrade you wish to do (Standard or Database-only), take a look at the Reference Guide. It contains a lot of useful details about things that are important to know about upgrading.
Detailed upgrade instructions that help you retain your customizations while upgrading to new features, see Standard Upgrade - Recommended Procedure.
Alternatively, if you have a very old copy of Zen Cart and just wish to keep your database but start with new files, see Database Only Upgrade.
For additional help and support, visit the Zen Cart Documentation site and the Zen Cart Support Forum.