Page not found

I´ve used this app for over a year. But suddenly after the latest WP update it´s not working anymore. Page not found is what i get when typing in the correct url for login.

I´ve tried to deactivate the plugin and activate it back. I tried to change the url, same result, page not found. I tried to uninstall the plugin and then reinstall it. Not working, page not found.

I tried thre different browsers, firefox, safari and chrome. Same result on all of them, page not found. As soon as i deactivate or remove the plugin i can login on the wp-admin login.

Whats going on? Please fix your plugin.