download the mac version rather than the windows version maybe? never heard of the app but on googling the website has a windows download and then separately an os x download
From what I see, the app is written is mono (which like the Java platform let's developers build apps that runs on both Windows and Mac). For the Mac version, you need to install the Mono runtime too, for which a URL is provided on the same download page. So, it's two downloads/installs to get the app running on a Mac.
I found a youtube video that has a mac version for the ratiomaster! You can download it for free and watch the video if you don't know how to use it! Your Welcome..