MySQL: FluxBB will not work at all with any version prior to 3.23.17.
PostgreSQL: FluxBB 1.2.* has been thoroughly tested on various versions between 7.3.3 and 7.4.5, but it should work fine with any version greater than 7.0. Please note that PHP 4.3.0 or later is required for PostgreSQL support.
SQLite: FluxBB 1.2.* has only been thoroughly tested on versions 2.8.11 and 2.8.14 of SQLite, but should work with basically any version.
upload/ into the directory where you want to run your forums.install.php from the forum root directory (e.g. open http://mydomain/myforums/install.php in your browser). Follow the instructions.Please report any problems you might encounter during installation in the FluxBB.org forums.