Following is a list of some of the documentation available in the downloaded Zen Cart ZIP.
Click the link to open.

About Zen Cart™

1. Read me first -- Installation

2. Read me first -- Upgrading from a prior version

3. Configuring PayPal IPN

4. Customizing HTML Email Templates

5. Security - Securing Your Site

6. What's New in v1.3.0.2 (listing of new features and bugs fixed)

7. Changelog for v1.3.0.2 (listing of changed files)

8. Summary/Explanation of Product Types