NEM (XEM) wallet on OSX?

I'm pretty new to this reddit and, quite frankly, XEM in general. I downloaded the NEM wallet installer via their website (https://bob.nem.ninja/installer/) but when I try to open the .zip its begins to open and then a message pops up requesting a password for ".empty"

I'm assuming i downloaded a file for windows but is there a place to download an OSX version?

Thanks!

edit: OSX*