Oh, another tip, that Epson software may not actually be required to use the scanner. I'm not sure if Epson software is as bloated at HP junk, but if you want to try and use the built in software instead, do the following:

Click the magnifying glass (Spotlight) in the upper right, and search for a program called "Image Capture". This is the built in OS X app meant to do image imports from either a camera, or a scanner. If it supports the Epson scanner, it will show up on the left hand side under the scanner session. (Alternatively, you can open a Finder window, navigate to the Applications folder, and open Image Capture from there)