I'm running Adobe Reader 10, OS 10.6.8, Safari 5.1.
The PDF file opened in my browser just fine. I then went: FILE / SAVE (or Command - "S") and saved to desktop. Shows as a pdf and opens just fine in Adobe Reader 10.
Also, if I right-click on the link in your post I can select "Save linked file to downloads" and it does and I can open it from there with Adobe Reader 10.