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You can access site.xml to get features link. then unzip features, after take a look at it's feature.xml, you'll find all the plugins URLs bellow.

http://studioupdate.zkoss.org/studio/update/plugins/org.zkoss.eclipse.editor0.8.2.v200809151718.jar http://studioupdate.zkoss.org/studio/update/plugins/org.zkoss.eclipse.setting0.8.2.v200809151718.jar http://studioupdate.zkoss.org/studio/update/plugins/org.zkoss.eclipse.newzkfile0.8.2.v200809151718.jar http://studioupdate.zkoss.org/studio/update/plugins/org.zkoss.eclipse.services0.8.2.v200809151718.jar

But as you mentioned, it's not recommended to install Eclipse Plug-in like this.