I can download this by hand in IE.
http://scholar.google.com/scholar.ris?q=info:j8ymU9rzMsEJ:scholar.google.com/&output=citation&hl=zh-CN&as_sdt=2000&
This is what happened with me:
I was trying to download a (public) .xls file (via DownloadFile method) which was getting downloaded comfortably from all browsers.
After trying and struggling with all answers (but no luck), I finally opened the Stack and noticed something odd (refer screenshot).
Although, the file was getting downloaded via http in browser but it was giving 403 error via DownloadFile method.
Finally, I just changed the URL from http://something to https://something and it worked fine.
Hope this helps!