macOS support back online (kind of)

Apologies for the issues with the macOS version of the file!! I BELIEVE I have fixed the issue, but I would really appreciate feedback from osX users to make sure it's actually functioning this time. I have included very specific instructions in the download instructions to help iron out a launch error specific to macOS. It's an odd solution and I'm working to find something a little less troublesome, but until then the demo should be functional now.

-Cherry (-: