That's weird. Is it maybe just a temporary problem? (→ retry now)
If it's not: When you hover over the download links (either mirror or the normal one), does the little popup showing where the link leads to include "?version=1.12.2-2.1.4"? How about when you right-click on one of them and select "Copy Link" and then paste it somewhere?
Do you have any special browser addons installed which might be messing with those links?