We won't dwell on the updating process as it may vary over time and depend on the installation method. For each new release, the Zenoss team will publish any specific steps you need to take to update your installation.
Zenoss updates frequently and as I write this sentence, the current version is 3.03.
To view version information about the current Zenoss Core installation, navigate to Advanced | Settings | Versions (see the following screenshot):
The Versions tab shows us version information about Zenoss Core, its core components, and the host operating system. In the Check For Updates table, we can click the Check Zenoss Version ...