function set_role_from_tags( $user_id, $user_tags ) {

    if( in_array( 'Compro Premium Gold' , $user_tags ) ) {

        $user = new WP_User( $user_id );
        $user->add_role( 'premium_gold' );

        if( in_array( 'Usario Free', $user_tags ) ) {

            wp_fusion()->user->remove_tags( array( 'Usario Free' ), $user_id );

        }

    }

}

add_action( 'wpf_tags_applied', 'set_role_from_tags', 10, 2 );