The installation and launch will be fairly straightforward, it's easy to follow the instructions. 

You need CrossOver, don't use PortingKit or other analogs - they don't work, I tried in the worst case the launch fails, but the mouse didn't work. 

We use CrossOver - a library with a official website, a library through a green magazine uttorrent, and the program itself can be found without problem on RuTracker. 

Next, we go to CrossOver and there we select Steam - it's on the main page in the part of applications - we press install. Follow the installation - it opens a new window and doesn't cause any difficulties, everything is clear. 

After installing Steam, authorize it and install Heroes. Everything. Launch and play. After launching the game, it can be launched directly from CrossOver not from Steam.