Installing Brother MFC-J450DW Drivers for Mac OS X 10.x
The Mac Tutorial Shows You Step-by-Step How-to Download and Install the Brother MFC-J450DW All-in-One Printer and Scanner Drivers on Mac OS X 10.12-Sierra/10.11-El-Capitan Unix/BSD Desktop.
The Brother MFC-J450DW Wireless Inkjet All-in-One w/Auto Document Feeder is part of the Brother Work Smart Series. Easy to use, fast print speeds, and duplex.

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Download Brother MFC-J450DW Printer Mac OS X Drivers:
Get the MFC-J450DW Series Printers Printer & Scanner Packages.
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Double-Click on .dmg Brother Archive on the Downloads Folder
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Double-Click on Brother Package icon
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Then simply Follow the Installation Wizard
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Then Follow the Same Procedure also for Scanner Driver