Browser Issues

I’ve been using the plugin for a while with no problem, but since the update made yesterday to version 1.6.14 I’ve encountered an issue where only Internet Explorer and now also Firefox can reach the page with the registration form while other internet browsers such as Google Chrome end up with a HTTP 404 error. I am wondering if perhaps some changes made to the plugin is leading to this problem and if you had any ideas on getting around this?

https://ww.wp.xz.cn/plugins/events-made-easy/