Downloads perfectly as an Illustrator file (.ai) for me. Can you maybe post some screenshots or something of what you are seeing?
Here's what I'm seeing on my end.
I'm fairly sure it's not an issue with Photoshop Elements 11, as I am able to open other .ai files in the program. As well, I had someone with Adobe Illustrator try to open it on their computer, and they had issues with it as well. Unfortunately, Photoshop Elements is all that I have access to at this time.
As you can see it is a .ai file for Adobe Illustrator. Many newer Illustrator files may contain elements that are not yet compatible with other vector apps. So it will need Illustrator. If you reach out to me in a private message with your email and size requirements I will convert the file for you into something you can use with Elements.