Plugin was working but not anymore

My client http://www.wsspc.org/members/member-states/alaska/ requested email addresses to be encrypted and I was using this plugin and it was working graeat! I installed it on another client’s site today and it wasn’t working so I came back to the link above to check and noticed it not working anymore. I’m wondering if it is due to the recent WP update?

https://ww.wp.xz.cn/plugins/email-address-encoder/