I don't know why you got that error so it's impossible to say. Let us know if it happens next time and I can try investigating further (it's quite likely to just be a temporary problem).
Our CDN system is a distributed CDN solution (apparently) and should deliver the files to you efficiently but we have seen some geographical anomalies. From what geographical location and prime IP address (first 2 sets a and b from aaa.bbb.ccc.ddd IP address) were you attempting to access the CDN download file?
Could you also try it again today please to see if it was some temporary network issue?
Greg: I am in USA, Alabama. The first 6 digits of my IP address (that is, the IP address of my ISP) (is that what you mean?) is 173.243. The download site, BTW, is working just fine for me today.