public void setDownloaded(boolean downloaded) {
        this.downloaded = downloaded;
    }
Sets if the plugin was downloaded. Once a plugin has been downloaded
it may take a couple of seconds to be installed. This flag only makes sense for
plugins since we currently do not support download new openfire releases.

@param downloaded true if the plugin was downloaded.
xmppserver/src/main/java/org/jivesoftware/openfire/update/Update.java