Once you have a Windows emulator program working on your Mac, you should be able to install and run the Windows version of EthiCola from the main download page (see the link at the bottom of this file); just click the big words CLICK HERE after the words "to install EthiCola in Windows"). But let me tell you one more thing first.
Depending on what setup options you pick, you may end up with a EthiCola.exe icon on your desktop (which you can double-click to start EthiCola), a similar LogiSkor.exe icon for the scoring program (if you checked the box to install this), and an EC folder for your scores and other supporting files; you must keep the programs and folder together (or else the programs lose access to scores, configurations, slides, and so forth), but you can put them together into another subfolder if you'd like.
For other ways to run Windows programs (like EthiCola) on your Mac, try either of these searches:
Here you're on your own; but if you find something that works well and is FREE, you might want to contribute to a wider discussion about it (see link below).