Remove Expired course status when user did not start the course and Enable course status from course start.

function.php

add_filter('wplms_expired_course_button',function($button,$course_id){

if(is_user_logged_in()){
    $user_id = get_current_user_id();
    $course_status = bp_course_get_user_course_status($user_id,$course_id);
    if($course_status == 0){ //USer subscribed but not started
      $init=WPLMS_tips::init();
      if(!empty($init->lms_settings['calculate_course_duration_from_start_course'])){
        $expiry = bp_course_get_user_expiry_time($user_id,$course_id);
        if($expiry < time(){
          bp_course_update_user_expiry_time($user_id,$course_id,$new_time);
          return '<a href="'.get_permalink($course_id).'" class="course_button button full">'.__('Start Course','vibe').'</a>';
        }

  }
}

}
  return $button;
},10,2);