It's being blocked by our Unified Threat Management solution which uses vendor specific anti-malware measures to be precisely. It's possibly checking file hashes against VirusTotal or whatever. That's not the important point right now.
Just that I understand your proposed solution correctly: you want me to to whitelist the download of the "epi.exe", which isn't digitally signed, and ignore the VirusTotal results of other AntiVir products?