Files with the extension (Apple Disk Image) are the standard format for distributing software on macOS. When you download a driver or utility for an Epson product on a Mac, it typically arrives as an epson-xxx.dmg file, where "xxx" represents the specific software version or printer model. What is an Epson DMG File?

A DMG file acts as a virtual "digital reconstruction" of a physical disc. For Epson users, these files are secure containers that hold the necessary installation packages ( .pkg files) and setup assistants needed to connect your printer to your Mac. How to Install Software from an Epson DMG

Installing from a DMG file is a straightforward process on macOS: Installing Epson Printer Drivers on MAC