Problem with printer software for High sierra

Here is a link to the last update to Epson printer drivers from the Apple Support pages, Epson Printer Drivers v3.3 for OS X this was released on the 6th July 2017 before High Sierra came out. I don't know if you have this already installed but it may be worth a try as it supports your printer in Sierra.

As mentioned before the Epson website does not have a specified driver for High Sierra so trying the Sierra one might help.

What OS did you upgrade from?

What do you mean you cannot get the updated software?

Have you clicked on the link I gave you and pressed the download button. Once downloaded you need to double-click it to install it. Have you looked in System Preferences> Printers & Scanners, is your printer listed there?

You could try resetting the printing system, macOS Sierra: Reset the printing system same works for High Sierra.

Did you make a full back up of your Sierra install before you upgraded to High Sierra, if so you can boot to your recovery drive and restore from your Time Machine backup. You should make a backup of your High Sierra install so that once you have restored Sierra from your Time Machine backup you can then restore files you created/ updated in High Sierra to Sierra. If you don't have a Sierra back up, you need to make a full backup of High Sierra, then boot to your recovery drive, erase your disk, and then reinstall macOS, https://support.apple.com/en-gb/HT201314 depending on what OS your mac came with will determine what OS is installed. It may be an earlier version of Mac OS X like El Capitan or Yosemite in which case once that was installed you would then need to upgrade to Sierra , by clicking here,

How to download macOS Sierra - Apple Support

seems like Epson currently don't support High Sierra http://esupport.epson-europe.com/ProductHome.aspx?lng=en-GB&data=VkjUmbBFNN0vHKr B6IVSCh94VZU002F8aiZAsWqKdlt8IBUU003D&tc… for that model of printer, you can try the older driver or contact Epson or downgrade to Sierra

If you are using WiFi to connect the two then try it with a USB cable instead.

Switch everything off and restart, is the printer now online?

So what was the problem, was it WiFi or something else?