You will need to choose between and 64-bit versions. To check this, go to System > About .
The official Epson L1800 driver is available for: epson l1800 driver
A driver is a software program that enables your computer to communicate with your Epson L1800 printer. It translates the print commands sent from your computer into a language that the printer can understand. Without a driver, your printer won't be able to print documents or photos. You will need to choose between and 64-bit versions