1) PHP REQUIREMENT LINK : https://github.com/Fred89/flatboard/tree/v3.2?tab=readme-ov-file#requirements or https://flatboard.org/view.php/plugin/page/p/docs
2) Give writable permissions to root folder and 'theme' folder while manual installation.
3) Copy entire contents of the /data folder except the config files in /data/config/config.dat.php, /data/plugin/onlineDB.dat.php, /data/key.php.
4) User would need to assign writable permissions on Non suPHP servers to config file /data/config/config.dat.php for adding moderator, editing site details, or to change the theme.
5) For manual installation no need to use their unpacker(index.php) file provided outside the zip package as we unzip manually via unzip command.
6) Release date taken from here : see changelog
7) Keep editor as "BBcode" in manual installation.