I tried installing Heroes 3 using your Portingkit, I had the game downloaded from GOG.com and it is in the downloads folder (no folder created). When trying to install, it gets an error while creating the wrapper which leads to the installer quitting. The error states:
“Wrapper creation terminated! The wine prefix creation failed"
I run Elcapitan 10.11.3 on a macbook pro.
I hope you can help me out here, was really looking forward to play an old classic.