this already happened to me a few times, but it happened again today, so I'm here to report. I used developer tools in firefox to understand what happens, and found that this is probably due to extremely long .blend filename, which expands its div container so much that it (partly) covers the three blue action buttons below ("flag", "favorite", "download")
In the image above, the file I was downloading today (question is Can't identify where this lip is in hiding in this model).
As you see, all three buttons are partly covered (but normally you can't see where, in the image above the oversized div is visible just thanks to the firefox developer tools) and, if you click on their respective "uncovered" areas, their link works, but not on the "covered" areas.