This download does not include the Java Runtime. You will be prompted on startup for the path for the JRE. The minimum is JRE 1.6.
To install and run: - Ensure you have a JRE installed, if not, download here * (For 64-bit Intel Macs, download Java for Mac OS X 10.5, Update 1. For the latest version of MacOs, use the Software Update feature) - Download the file above - Extract the archive into any folder - Double-click the OracleDataModeler.app file