Appointment+ choose services dropdown to radio buttons


We would like to make some modification to the way you choose the services in the appointment+. The same question has been asked here:

However, this does not seem to be the case for the current version. I can see that the bellow is the code that generates the dropdown:

<div class="app_services_dropdown_select">
<select id="app_select_services" name="app_select_services" class="app_select_services">
<?php foreach ( $services as $service ): ?>
<option value="<?php echo $service->ID; ?>" <?php selected( $service->ID, $selected_service ); ?>><?php echo stripslashes( $service->name ); ?></option>
<?php endforeach; ?>
<input type="button" class="app_services_button" value="<?php echo esc_attr( $args['show'] ); ?>">

Can someone help us change this from dropdown to radio buttons?