I've been in touch with Shimon and he has tried to fix it, but I still get the same problem. There appears to be something strange going on with Google Drive.
But I noticed something -- when you first get to the Google Drive page and the the circle is chasing itself, there is a download icon in the upper right that disappears when the circle catches itself and it reports that the file is in the owner's trash. If you click on that icon while it is there, it will download the .zip file.
Well, it seems other files in the course are affected. Right out of Week 1's first modules, Appendix A (Drive link) of the book and Chapter 1 of The Elements of Computing (Drive link) are missing, these being the links provided in Coursera.
Chapter 1 can be found with a filesusr.com link on the website and Appendix A I got by doing the "click on the download icon before it disappears" method mentioned by WBahn.
It's likely all files in the course are affected at the moment, though. I hope they manage to make it work out.