You can get the latest Version of the Plugin for Moodle from the Moodle Plugin database .
You simply download the ZIP or TAR package and unzip it to Moodle's "mod" directory.
Eventually you need to unzip the package into a folder called "openmeetings". The folder structure is:
Then you visit the admin interface of Moodle, for example http://$your_moodle_host/$MOODLE_WWW_ROOT/admin
Moodle will detect that there is a new plugin and will show the plugin installation screen:
After you have clicked on "Update database" Moodle will show you the plugin configuration screen:
After installation of the plugin you can go to the course pages in Moodle and turn editing on. Then you choose the activity "OpenMeetings", Moodle will then show you the conference room configuration with all the options: