I’ve been using the (Adaptive Security Virtual Appliance) for several lab and production deployments, and the software download process via Cisco’s official portal has been consistently smooth and professional.
Always check the “Release Notes” linked on the download page. Look for “Open Caveats” and “End of Software Maintenance” dates before downloading. Cisco Asav Software Download
: Typically a ZIP file containing .ovf (for vCenter) or .esxi files. I’ve been using the (Adaptive Security Virtual Appliance)