During installation with PostgreSQL 7.1. after the main tables have been installed correctly, the script went back to the Copyright notice (started from the beginning). After some tries I got a look into the script, and found the section where the main tables installation checking is happening. There I edited the two "$maintables = false;" lines to "$maintables = true;". So the installation effectively skipped the checking and finished without problems, now the site is working (of course in test mode). Before do this cheating I looked at the database with psql and everithing was already there, the database was totally empty before, so I dont know why tha check failed.
Other little problem: when logout, I received the following message:
Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0
The logout was successful. PHP version 4.3.0. register_globals is enabled in php.ini, so?
Third: when I used the "wget" form of the cron.php in crontab, I received an notification email message in every 5 minnute saying that the cron job was successful, and the apache log line of course.
So I choosed the php calling instead.