Software downloads are hosted on their own high speed, high bandwidth server. This document explains how to access and download software and updates.
The download server URL is: https://delivery.zenoss.com/
You will be prompted for your login ID and Password for the support portal.
If you have issues accessing the download site (you must be an enterprise customer with a support portal account), or if you don't see software that you think should be there, either open a ticket in the support portal or have a colleague with support portal access do so on your behalf.