You can update SuperMail 2.0 by reinstallion or you can use updater (we recommend the updater).
Just log in as nativeadmin and go to Settings. At the Update tab you'll see:
Here you can see your current Supermail 2.0 version, the latest available version and the main changes between current and latest version.
Proxy server - If your firewall setup blocks updater, you may consider configuring proxy server. NOTE: only set this up if required!
Each time you update Supermail 2.0 a backup is created, so you can easily Rollback to it. Just press Rollback button.