So I've picked up that free copy on the Epic Store, and found this video on Youtube explaining how to install it using CrossOver: https://www.youtube.com/watch?v=Bn_Co6cW7a8
I've downloaded Heroic last night, logged in, and started the download. In the middle of the night, I shut my laptop, only to find out in the morning that my 70%-complete download got cancelled. So just a word of advice: don't interrupt the download (:
I am re-trying it tonight, and will report on the rest of the installation tomorrow.