Thank you Karlie,
Your second suggestion is the closest, although I had to do it as part of software installation dialogue box. It appeared 'Wi Fi' settings were buried under title 'LAN set up option. And even after clicking that set up option, I had to force the software to allow me to input my Network name, printer's IP address and confirm Printer MAC address.
As soon as I tried it, all error messages disappeared and software got installed correctly.
Printer is now configured and working fully on Wi Fi connection.
In follow up I had to do something on the same lines for Scanner to work via WiFi.
Epson support Web site and online support proved to be too long winded and not in the right direction. They only provided guidance to follow their dialogue box and any direct suggestions to what if any action was required. Telephone support proved to be even worse. Had to hang up the phone after waiting for nearly 45 minutes!
In summary, Epson product is good, but Support appears to be in the other direction.
Once again, thank you for some useful directions.
Best Wishes
Suren