I already solved my problem: I set up manually config.php
file (according to the instructions on this page: http://www.phpbb.com/community/viewtopic.php?t=19243
) and I loaded it to the server. Then, I continue with the instructions of the "INSTALL" and finally delete folders "INSTALL /" and "CONTRIB /"... And ready ... Of course I had to reload my MODS and other personal settings ...
however, next time, follow the instructions for updating.
you do NOT run the install when updating.
you do NOT touch the config.php file at all.
If you have MODs installed, you should be doing the code changes method which does not involve uploading the contrib folder at all and only involves uploading the included install folder so you can run the database update script.