Viruses are much harder to get on a Mac, so I would not worry too much.
As for the script issue, that is odd.
Are you certain you chose the "FHunix.POL" file when running a local script?
Are you getting the same message when trying to do it again?
You can try redownloading the script just in case.
You can also use WineSkin to run FeralHeart instead,
I am more than happy to help out if you wish to try.
It works perfectly fine on my Mac.
Can you provide screenshots on what it is doing with the Wine?