Hi @FredT. Thanks for reaching out to us. 
Below is a link which helps you to the downloads sections on Nutanix Portal.

https://portal.nutanix.com/#/page/releases/nosDetails ==> You can select the component that you want to know more about and the latest GA versions will be listed from there. You would also be able to download them and test them in your Nutanix cluster.

https://portal.nutanix.com/#/page/docs/list?type=software ==> This is the link for Nutanix Product Documentation and I hope this should help you as well.

Feel free to let us know if you have any further queries and we would be glad to help!