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hmm... i don't know if it would quite work, because the XOOPS installer will expect an empty database and will throw up errors when it tries to create a table that already exists.
you could always try downloading the XOOPS patches and install them one by one until you get all the way up to the most recent stable version. that way, the site and its information will stay intact.
hope that helps!
-zimmi88 =)
"Need coffee, keep away..."