This link will download the Cube installer, which will in turn download the latest Cube from the DataMiner agent you are connecting to, and optionally from the latest public online version depending on whether the client machine has internet connectivity.
The Cube versions (as zip file or or MSI installation package) are currently not available as a separate download, they are only included in the full DataMiner installer/upgrade packages.
See also this related question: https://community.dataminer.services/question/where-to-get-the-latest-cube-installer/
The link in your image will install a desktop application in which you can manage all your different DM Agents. By clicking on an agent the correct DM version will automatically be installed in the background.
In case you want to use a specific version, you can right click on one of the Agents as shown in the image below.