the upgrade script goes with each vBulletin release, you can find it in the package downloaded from vbulletin.com
You can read that script, step by step and find out what the script does.
Quote:
Is there a script to upgrade the DB?
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basically yes.
You will have to change the files yourself, to fit the database (if there's any database structure changed)
but, remember to BE CAREFUL when you use it. Recommend to test in testing forums first, if you're not sure.