Upgrading to Nagios Xi 5?
If you are using Nagios XI 2014 or later, you can upgrade your Nagios XI instance easily from the web UI, provided your server is connected to the Internet.
Upgrade Nagios XI From Web UI
Here’s how you do it:
From the Nagios XI web interface navigate to the Admin menu, click Check for Updates menu on the left, then click Check For Updates Now. If an update exists, the most recent version will be displayed and you can click the Upgrade to Latest Version button to start the upgrade process.
Note: If you are running the most current version, the Upgrade to Latest Version button will not be displayed.