Unfortunately, the Mac version is no more, thanks to a bad hard drive and no backups. While you can find older versions for the Mac out there, the problem is getting a serial number so it will keep running. Fortunately for me, I still have a registered copy running on my Mac under Mac OS9, thanks to "[Chubby Bunny](https://happymacs.wordpress.com/2015/05/15/sheepshavers-and-chubby-bunnies-the-weird-and-wonderful-world-of-classic-on-intel)" someone released a few years back: ![Ace Reader Running under Chubby Bunny](http://www.cheapandsleazy.net/images/chubby_bunny_ace_reader_pro_1.png) Make sure you read all of the comments if you want to go that route. Only three stars, because of the "No More Mac Support" issue.