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radiohead, welcome on the XOOPS forum!
I am afraid, there is no upgrade script available. However with a little knowledge of
SQL, you could do
a lot.
Install XAMPP together with a backup of your site on your local PC. Install in the same(!) database XOOPS (2.3.3) and the News (1.63) module. With phpMyAdmin, you can run SQL statements to copy the info needed.
(For users there is also an
import from CSV file script.)