Disable login/register pop-ups and use only default static pages

Add the following to your child theme's functions.php file:

add_filter( 'wpj_included_plugins_list', 'custom_wpj_included_plugins_list' );
function custom_wpj_included_plugins_list( $plugins ) {

	$plugins = array_values( array_diff( $plugins, array(
		'zm-ajax-login-register/plugin.php',
	) ) );

	return $plugins;
}

Login and Register URLs will direct to "https://example.com/wp-login.php" and "https://example.com/wp-login.php?action=register" instead of opening a pop-up. 

If it doesn't work, check your link's anchor (href). Some links use "#" or nothing as anchor, so you will need to change them to "https://example.com/wp-login.php" and "https://example.com/wp-login.php?action=register".