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Someone here saved my life...
I discovered something very interesting: you can duplicate a database, change the mainfile.php login info and connect to the new database without any visible difference.
This information can save your life. Or save your time. Once your XOOPS site is configured and running, before adding contents... why to install? just copy the database and teh XOOPS folder to the new site, change the database login info and you got it.