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There hasnt been an OS specific driver for that printer since Snow Leaopard.
To install the printer on 10.11, follow these steps.
The latest printer driver for this product is available from Apple's Software Update. Here's how to get it:
USB: Connect your product to your Mac using a USB cable and make sure the product is turned on.
Wireless: Make sure your product is turned on. Connect your product to your wireless network.
Ethernet: Connect your product to your Mac using an Ethernet cable and make sure the product is turned on.
In the screen that appears, select your printer model as below:
USB connection: Select the EPSON Series (USB) product.
Wireless or Ethernet connection: Select the EPSON Series (Bonjour) product.
Select your EPSON Series product in the Use or Print Using drop-down list, then click the Add button.
Note: Apple Software Update may find multiple updates for your system. You may choose to install all or some of the updates.
Compatible Systems: Mac OS X (v10.11.x)
Also, would you like me to connect to your computer from here and work on the issue directly on screen? If so we can set this up via a secure remote assistance session. That session is guaranteed meaning if I cant help you then you will be entitled to a full refund of all fees.
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