The Social links on DW Timeline: About Widget

Hello Miguel ! 
1. We have checked on our demo, the  DW Timeline: About widget still works fine.
Firstly, please deactivate  all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one and let us know if you find the problematic plugin(s). Maybe there is a conflict in plugins.
If you still face there issue, you can send me username & password of your site for further checking (via private answer).
2. To add the Soundcloud, Instagram and Tumblr icons in the DW Timeline pro, you can open the widgets.php file in the folder path “\wp-content\themes\dw-timeline-pro\lib”. Find the line 45 to line 68,
Replace the following code: 

 public function widget( $args, $instance ) {
 $avatar = $instance['avatar'];
 $description = $instance['description'];
 $facebook = $instance['facebook'];
 $twitter = $instance['twitter'];
 $google_plus = $instance['google_plus'];
 $youtube = $instance['youtube'];
 $linkedin = $instance['linkedin']; echo $args['before_widget'];
 ?>
 <div class="widget-about">
 <div class="text-center"><img class="avatar img-circle" src="<?php echo $avatar ?>" alt=""></div> <p class="description text-center"><?php echo $description ?></p> <ul class="share list-inline text-center">
 <li class="facebook"><a href="#"><i class="fa fa-facebook"></i></a></li>
 <li class="twitter"><a href="#"><i class="fa fa-twitter"></i></a></li>
 <li class="google-plus"><a href="#"><i class="fa fa-google-plus"></i></a></li>
 <li class="youtube"><a href="#"><i class="fa fa-youtube"></i></a></li>
 <li class="linkedin"><a href="#"><i class="fa fa-linkedin"></i></a></li>
 </ul>
 </div>

With new Code: 

 public function widget( $args, $instance ) {
 $avatar = $instance['avatar'];
 $description = $instance['description'];
 $facebook = $instance['facebook'];
 $twitter = $instance['twitter'];
 $google_plus = $instance['google_plus'];
 $youtube = $instance['youtube'];
 $linkedin = $instance['linkedin'];
 $instagram = $instance['instagram'];
 $tumblr = $instance['tumblr'];
 $cloud = $instance['cloud']; 
 echo $args['before_widget'];
 ?>
 <div class="widget-about">
 <div class="text-center"><img class="avatar img-circle" src="<?php echo $avatar ?>" alt=""></div> <p class="description text-center"><?php echo $description ?></p> <ul class="share list-inline text-center">
 <li class="facebook"><a href="#"><i class="fa fa-facebook"></i></a></li>
 <li class="twitter"><a href="#"><i class="fa fa-twitter"></i></a></li>
 <li class="google-plus"><a href="#"><i class="fa fa-google-plus"></i></a></li>
 <li class="youtube"><a href="#"><i class="fa fa-youtube"></i></a></li>
 <li class="linkedin"><a href="#"><i class="fa fa-linkedin"></i></a></li>
 <li class="instagram"><a href="#"><i class="fa fa-instagram"></i></a></li>
 <li class="cloud"><a href="#"><i class="fa fa fa-cloud"></i></a></li>
 <li class="tumblr"><a href="#"><i class="fa fa-tumblr"></i></a></li>
 </ul>
 </div>

– Find the line 87 add the following code: 

 if ( isset( $instance[ 'instagram' ] ) ) { $instagram = $instance[ 'instagram' ]; }
 if ( isset( $instance[ 'cloud' ] ) ) { $cloud = $instance[ 'cloud' ]; }
 if ( isset( $instance[ 'tumblr' ] ) ) { $tumblr = $instance[ 'tumblr' ]; }

– Find the 119 add the following code: 

 <p>
 <label for="<?php echo $this->get_field_id( 'tumblr' ); ?>"><?php _e( 'tumblr:' ); ?></label> 
 <input class="widefat" id="<?php echo $this->get_field_id( 'tumblr' ); ?>" name="<?php echo $this->get_field_name( 'tumblr' ); ?>" type="text" value="<?php echo esc_attr( $tumblr ); ?>">
 </p>
 <p>
 <label for="<?php echo $this->get_field_id( 'cloud' ); ?>"><?php _e( 'cloud:' ); ?></label> 
 <input class="widefat" id="<?php echo $this->get_field_id( 'cloud' ); ?>" name="<?php echo $this->get_field_name( 'cloud' ); ?>" type="text" value="<?php echo esc_attr( $cloud ); ?>">
 </p>
 <p>
 <label for="<?php echo $this->get_field_id( 'instagram' ); ?>"><?php _e( 'instagram:' ); ?></label> 
 <input class="widefat" id="<?php echo $this->get_field_id( 'instagram' ); ?>" name="<?php echo $this->get_field_name( 'instagram' ); ?>" type="text" value="<?php echo esc_attr( $instagram ); ?>">
 </p>

 3. To limit the number of pages appearing, you can log in to Dashboard > Setting > Reading, then add the number in the Blog pages show at most section.
4. We have checked your link, I think you have disable the DW promobar plugin in your site.  Also, the link that you have provided does not the DW Timeline pro.
Hope this helps !