If you’re getting SQL errors about table names with “wp-inst” in them make sure you’re not calling setup-config.php or install.php by the urls wp-inst/wp-admin/setup-config.php and wp-inst/wp-admin/install.php
The correct url should be http://example.com/main/wp-admin/setup-config.php and http://example.com/main/wp-admin/install.php
The “main” part of the url is handled by mod_rewrite. Follow the links in the installer and you’ll be fine! 🙂