Using the search box provided at the top of the page, search for Workload Automation AE.
Click on the Workload Automation AE product that is populated below the search box.
On the resulting page, you should see a product resembling CA Workload Automation AE Production Server WINDOWS - ALL. Note: There are additional available options that you may see other than this one, which include: CA Workload Automation AE Server WINDOWS-ALL, CA Workload Automation AE Server - FOC WINDOWS-ALL, etc They're all the same so just choose one.
Click on the product name CA Workload Automation AE Production Server WINDOWS - ALL, or derivative thereof, as this will include the media for Linux/Unix as well.
Now, toggle the Release selection and Service Pack drop downs accordingly for the desired/appropriate media for your environment.
Click on the Download icon (cloud with arrow pointing down) on the line of the product to begin the download process.