Replace the files in:

public / ajax /
-- addPost.php
-- ajax.timeline.php
-- get_all_post.php
-- get_post.php
-- getData.php
-- post_details.php
-- timeline.php

class_ajax_request
-- classAjax.php

IMPORTANT: Make a backup of your files before replacing, for security reasons. Or you can install the script in another directory to test before replacing.

Thanks!