Try this, enable the plugin again, then in your child theme functions.php file add this code:
function sf_enqueue_styles_new(){
wp_deregister_style('fontawesome');
wp_dequeue_style( 'fontawesome' );
wp_register_style('fontawesomeNew', '//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css', array(), NULL, 'all');
wp_enqueue_style('fontawesomeNew');
}
add_action('wp_enqueue_scripts', 'sf_enqueue_styles_new', 111);
– Kyle