Unable to download APIC-EM GA without installing some third party plugin. Can't do it due to corporate security. Is there a hidden link to a plain old FTP or other standards-based download option?
Are you able to download it from Cisco.com at https://software.cisco.com/download/release.html?mdfid=286208072&flowid=77162&softwareid=286291196&release=1.0&relind=AV… . That shouldn't require a plugin.