Good morning,
I appreciate the reply, but I very clearly stated in my original post that I do NOT have any ad-blockers installed or enabled on any of the three browsers I attempted this with.
I have cleared the cache and cookies from all three, connected to a server in another country via proxy, and connected to my work network via VPN.
Another person at that same proxy DNS is able to view/download the file fine, so there's clearly an issue somewhere, but your stock response is not fixing the problem.