Mono Package for Wine is not installed

Do the following to install wine-mono:

1. Download wine-mono.msi from the official WineHQ site.
2. Type wine64 uninstaller.
3. Press install from the uninstaller GUI and select the downloaded .msi package.
4. Done!

Installing .NET instead should work as well. For example by the following commands in a terminal:

sudo apt-get install winetricks
winetricks dotnet45