The answer I sent was still problem specific, as you did mention the epson/library folder in your error.
Hence, after I suggested resetting the printing system, I mentioned deleting the epson folder from the system library..( to deal with the specific error you had )
We may also need to remove some of the com.epson files from your use / library / preference folder.. but I normally save that step until after we completed the steps I mentioned, as its not always needed.
You didnt ask for the refund link in your response. So if you are willing then lets start trying to work through these steps together.
Start here, by resetting the printing system.
Choose System Preferences from the Apple menu.
Click Printers & Scanners.
In some versions of OS X, this preference is named Print & Scan or Print & Fax.
Control-click anywhere in the list of devices on the left, then choose “Reset printing system” from the shortcut menu that appears.
Next, we need to remove the epson entries from the system library folder
go to the Macintosh HD > Library > Printers folder and remove the "EPSON" directory in there.
Now, is your hard drive actually named go to the Macintosh HD > Library > Printers folder and remove the "EPSON" directory in there. or "Mac HD"?
If not, then rename your hard drive to "Macintosh HD" ( without the quotes )
Only once these steps are complete, do we attempt to reinstall the printer.. So lets focus on those steps first, if you get stcuk let me know where so I can help you through it.