Installing Epson WF-7521 Scanner Driver for Mac OS X 10.x The Mac Tutorial Shows You Step-by-Step How-to Download and Install the Epson WF-7521 Series Printers Scanner Driver on Mac OS X 10.10 Yosemite Unix/BSD Desktop. Download Epson WF-7521 Series Scanner Mac OS X Driver: Get Epson WF-7521 Mac OS X Driver Epson WF-7521 Mac Driver. Double-Click on .dmg Epson Archive Double-Click on WF-7521 .pkg Installer Follow Wizard & Click on Install to Start Installation