Kepler does not support the org.eclipse.update package, which has been deprecated and replaced by equinox p2.
Eclipse Luna Integration
Fixed in DIRSTUDIO-1007, we now use the org.eclipse.equinox.p2.rcp feature.
Ok, now I understand. Let's fix that when we update the RCP application to Luna.
It's a compilation issue. Some packages are not found simply because they have been removed in Kepler. I have not tested the installation of the plugin.
Is there a concrete error or problem? Can't you install the Studio plugins into Eclipse Kepler using the update site?