lhungil is right. I was wrong. You need to upgrade to the latest 1.2.x first, then the latest 1.3.x, and then the latest 1.5.x
If it is not presenting you the option for "Database Upgrade", then you've probably got a different DB_PREFIX set in your old site configure.php vs your new site's configure.php, thus it can't find the required table names.
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