I got this game because it was free and I wanted to test it on Linux. Well it is a nice little game. and it runs perfectly on Linux. I am running Ubuntu 18.04.01 Radeon GPU and Wine staging. I am pretty sure it will run fine with Ubuntu's standard Wine but I like to game and Wine Staging is not hard to install if you go to Wine HQ.org. So if you have Linux and want a cool little game don't be afraid to take this one for a spin.
I like this game but not as much as Heroes 3. This game installs and runs well on Linux. I am using Ubuntu 18.04.1 with wine staging installed ( I have not tested it with the default wine on Ubuntu). I used Playonlinux to install the game. it runs fine but I needed to lower the resolution and uncheck fullscreen after you do this you can raise the resolution back up but do not check full screen character will be off screem play in window mode.
For anyone interested this game works flawlessly on Linux Ubuntu 18.04.1 Wine staging (the default wine works with it fine too). I installed it with Playonlinux. You will need to Google the HOMM3 HD patch and install it to in order for it to work properly I believe this is the case for Windows too. Too bad GOG doesnt have a list of games that run on Wine in Linux.