Hi.
 I have installed an XWiki 1.2.2 through a "XWiki Enterprise ZIP", and
 now want to upgrade to 1.3.
 From the documentation, it seems that easy
upgrades of the wiki 
 require the WAR installation, which I have not done. Do I have
to
 export my current wiki into a WAR (if so, how can I do it?), or is it
 done through a different method? 
Have you checked out "Upgrading an XWiki Installation" in the following
location?