Since the EPR303 is an ESC/POS compatible thermal printer, you can typically find drivers through these sources:
Many users find success using the Xprinter Receipt Printer Driver , as the EPR 303 is compatible with the "80 Series with Cutter" (POS-80C) driver. easypos epr 303 printer driver download link
: Manually enter the printer's IP address and use Port 9100 . Since the EPR303 is an ESC/POS compatible thermal