Facing Problem in All in One Video Downloader Script

I have found the PHP error related to the issue: [15-Dec-2019 15:09:00 America/New_York] PHP Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2005] Unknown MySQL server host ‘{{host}}’ (-2) in /home/anyvtkxx/public_html/admin/classes/database.class.php:13


It seems the author of the item already replied to your ticket 4 days ago on their support website: https://support.nicheoffice.web.tr/help-center?envato_item_id=22599418

Most probably, according to the error description, you have to set up the database hostname in a configuration file. I am sure it is explained in the support ticket on their support website, please check it.