Zen Cart® is derived from: Copyright 2003 osCommerce
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
and is redistributable under the GNU General Public License
This software is OSI Certified Open Source Software.
OSI Certified is a certification mark of the Open Source Initiative.
Zen Cart® v1.5.4 is compatible with PHP 5.2.10 through PHP 5.6, and MySQL 5.1 thru 5.6
(Note: security features are stronger when using PHP 5.3.7 or newer.)
(Note: PHP 5.2.x and PHP 5.3.x are deprecated and no longer supported by www.php.net ... You REALLY should be using PHP 5.5 if possible, for both security and speed benefits.)
Simple: if you are using v1.5.3 already and have not customized any of the files listed in the changed_files-v1-5-4.html document, then simply replace those files with the new files as listed.
If you HAVE customized or altered certain files, simply re-do your customizations in the new version of those particular files by making the same changes needed.
If you are using Addons/Plugins that have made alterations to those files, it is best to compare those changed files against the original Zen Cart files for the version those plugins were built for, and see what changes were there ... and then re-build those changes in the v1.5.4 file.
If you are upgrading from a version OLDER than v1.5.3, then please do a standard complete site upgrade.
For a list of files that have been changed since v1.5.3, see the changed_files-v1-5-4.html document.
Copyright 2003 - 2014 Zen Ventures, LLC — Zen Cart® www.zen-cart.com