Hi Kweder, after installing the unmanaged client, you can now schedule updates. them by opening the SEP software, go to settings, client management, then tweak the settings on the schedule updates tab, check enable automatic updates. But this is limited to security, engine updates only as what Grant said.
As for the product / version update, just check your symantec account regularly for latest releases. You can also ask your local sales to send notifications to you to get you informed when a new release is available.