Can I book a flight with Ryan Air and check in with just the confirmation code and no print out?

I need to book a flight back to London for someone who is abroad, but they have no printer or e-mail where they are. If I book the flight they would need to check in with the confirmation code written on a piece of paper, but no print out. Does anyone know if Ryan Air will accept that at check in?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).