I've been trying to get .net installed by hook or crook, but keep running into the same problem. Namely, it seems to be installed through winetricks, but the program I want to install doesn't know it's there. It prompts me, "Install .net 4.5", opens the installer, and then it never finishes. I can't close the window, either.
You can find the program in question at https://theaetherlight.com/download-aetherlight#. Maybe it just won't run in Wine...
