I presume these are the drivers you downloaded:
Epson support says:
"I am getting an IF4 error after installing the USB printer driver. The EPSON USB Printers icon in the Device Manager shows up as a Diamond and I get an error stating that there is a problem with the printer.
For some reason the USB installation may have gotten corrupted.
1. Turn printer Off
2. Go to Device Manager and Remove the EPSON USB Printer Device (EPUSB1:)
3. Go to Printers and remove the SP875DC driver
4. Restart the Computer
5. Once back to the Desktop, Power the printer on and it should Plug and Play USB correctly"
These may also help: