Re: Step two errors
I saw this in bb-admin/upgrade.php
// Very old (pre 0.7) installs may need further upgrade utilities. Post to https://lists.bbpress.org/mailman/listinfo/bbdev if needed
I wonder what version you were using? In bb-includes/functions.php, there is a section for version.
case 'version' :
Maybe that will help someone help the upgrade script for you.