If you look in the .zip file, you should find an INSTALL file, as well as an install.html... which include the following set of instructions:
Install instructions.
1. Move all files into a PHP enabled directory.
2. Edit main.inc.php. The only line you need to edit in this file is the
one that contains the $thispath variable. You will need to change
$thispath to the actual path of your ubbthreads installation.
3. Edit config.inc.php. The variables in this file control the database
settings used, path variables, special functions, etc.
4. Edit theme.inc.php. This file contains other special function settings
along with some look & feel settings.
5. You will need to create the database to be used either by using
mysqladmin, with something like 'mysqladmin create databasename' or
contact your host and have them create a database for you.
6. Depending on your sql settings you may need to grant privileges to
access your sql database. For instance, for mysql you would type
./mysql from the command line and enter the following lines below.
GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, ALTER
ON forumdatabase.*
TO nobody@localhost
IDENTIFIED BY 'password';
exit;
Make sure to change forumdatabase to the name of the database you will be
using. Also nobody and password needs to be changed to match your
settings in config.inc.php
7. You will want to move the directories /images and /stylesheets into your
HTML tree. The locations are referenced in the config.inc.php file
8. Now you can bring up createtable.php in your webbrowser and it will
create your tables for you and give you a link to add your admin user.
If you have any problems with getting it up and running after this, let us know!
Matt Reinfeldt
http://www.mattreinfeldt.com