Re: Recover Data
If you cannot access the old Tiki by logging into the site then the only way to recover data would be to export data directly from the old database tables, then import them into the new database. This can be done fairly easily with something like MyPHPAdmin.
If you can access the old Tiki then, I know that there are a few options for getting data from one Tiki to another, but I'm not fully familiar with them. Others may be able to assist you.