Hi jp,
The PKP Dublin Core Extender plugin can be enabled or disabled on the Administrator's "plugins" page. Once enabled, it will add a field to the administrator's archive edit form where you can choose the version of OJS being used.
Regards,
Alec Smecher
Public Knowledge Project Team
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Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada
http://ocs.sfu.ca/pkp2007/