Operating System: Mac OS (Note: might work with other versions of this os.)
C3400n Series driver installer for MAC OS X.5
Install instructions for Mac OS Users: 1. Click on file OSX53400EA.dmg.
2. Follow the instructions on your computer screen to save the file to your hard disk. (Write down the location where you saved the file.)
3. Double click the downloaded file on your system. This will extract the Mac Installer at the default file location.