Hi,
I was able to install NAM 36 on High Sierra with the download for Mac.
If you downloaded the file, open the DMG file. Move NAM36MacWrapper to the desktop.
Open the contents of the file (right mouseclick)
Doubleclick Wineskin
Select Set Screen Options
Un-mark Auto Detect GPU Info for Direct3D
Klick Done
Close all windows.
Start NAM36MacWrapper.
Now it would be enable to install NAM.
Success