Current Client Control version requires at least Openfire 4.0.0 http://www.igniterealtime.org/projects/openfire/plugin-archive.jsp?plugin=clientControl
Updating from 3.9.3 to 4.5.3 will be a huge jump and can be problematic. Wouldn’t be surprised if direct upgrade to 4.5.3 will fail in some ways. Maybe incremental updating is a better option.
Explanation: upgrading Openfire