The Aurena Agent can be downloaded from the Add-ons page in any IFS Cloud installation, like so:
In case you don't have access to any IFS Cloud environment, here is a link that allow you to download the latest/current version:
https://ifsdownloads.blob.core.windows.net/addon/AurenaAgent/SetupAurenaAgent.msi
The same version will work with Apps 10 Aurena.