There is no "Save a Copy" option

I would like to take an existing project and “Save a Copy” so that I can make an alternate version while preserving the original. However, I don’t get the “Save a Copy” button on the presentation page http://prezi.com/ysvctii1wkai/music-around-the-world/ 
I’m pretty sure it has the right permissions

(See attached screenshot).

I’ve tried Chrome on Mac OSX, Safari on Mac OSX, Chrome on Windows 10, and Edge on Windows 10. None of them give me the “Save a Copy” option.

Change the license from Pro Minus to Public on my account, because I can not work normally.

I’m not able to copy this presentation either. HELP PLEASE!