The app was never downloadable on its own,its basically just an app to register your printer that serves no real purpose. It is included in the driver installer, so the Macs that don't have it probably just are using Apple drivers instead of Xerox drivers.
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I've been searching for a download link for the Xerox PowerENGAGE app but haven't had any luck. Some of my staff have had it on their MacBooks and id like to try and get it installed on everyone's computers. This program just seems to have fallen off the face of the earth...