1. PHP REQUIREMENT LINK : https://github.com/freescout-helpdesk/freescout#requirements
2. Select (GMT-04:00) Eastern Time (US) in manual installation.
3. Always create blank .env file and give permissions before hitting installation URL , as script links redirect to root URL , even if its adjusted in .env, which installer creates.
4. set date.timezone = "America/New_York" in php.ini before manual installation and set the same in cache/config.php, .env and in sql  if there is any change in timezone.