Samsung SCX-4300 QuickStart on Mac OS X 10.x
The Mac Tutorial Shows You How-to Download and Install the Samsung Black and White Multifunction SCX-4300 Printer and Scanner Drivers for Mac OS X 10.6-Snow-Leopard/10.7-Lion/10.8-Mountain-Lion/10.9-Mavericks/10.10-Yosemite/10.11-El-Capitan.
Proceed before downloading and installing drivers for the Samsung SCX-4300 printer, and then follow the same procedure also for the scanner.
If the Samsung Printer Drivers for Mac OS X 10.11 are not available then you can still Use the Existing Ones for mac os x 10.6+…

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Download Samsung SCX-4300 Printer Driver for Mac OS X
Select the Samsung SCX-4300 .zip Driver
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Select Open with Archive Manager or Double-Click on .zip Package to Extract
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Double-Click on Install Software inside the PrinterDriver Folder
Solve App from Unidentified Developer:
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After Follow along the Samsung Drivers Installation Wizard
Accept the License
You choose How the printer will be Connected to the computer
The Printer Must be Recognized from the Installer!
Continue until the end of Installation… -
Download Samsung SCX-4300 Scanner Driver for Mac OS X
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Follow the Same Procedure as that for the Samsung SCX-4300 Printer Driver