Исправление question4, (текущая версия) :
GtkSharp 3.22 ставится NuGet-ом:
$ nuget install GtkSharp
Attempting to resolve dependency 'GLibSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'GioSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'AtkSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'GdkSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'CairoSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'PangoSharp (≥ 3.22.24.37)'.
Installing 'GLibSharp 3.22.24.37'.
Successfully installed 'GLibSharp 3.22.24.37'.
Installing 'GioSharp 3.22.24.37'.
Successfully installed 'GioSharp 3.22.24.37'.
Installing 'AtkSharp 3.22.24.37'.
Successfully installed 'AtkSharp 3.22.24.37'.
Installing 'CairoSharp 3.22.24.37'.
Successfully installed 'CairoSharp 3.22.24.37'.
Installing 'PangoSharp 3.22.24.37'.
Successfully installed 'PangoSharp 3.22.24.37'.
Installing 'GdkSharp 3.22.24.37'.
Successfully installed 'GdkSharp 3.22.24.37'.
Исходная версия question4, :
GtkSharp ставится NuGet-ом:
$ nuget install GtkSharp
Attempting to resolve dependency 'GLibSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'GioSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'AtkSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'GdkSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'CairoSharp (≥ 3.22.24.37)'.
Attempting to resolve dependency 'PangoSharp (≥ 3.22.24.37)'.
Installing 'GLibSharp 3.22.24.37'.
Successfully installed 'GLibSharp 3.22.24.37'.
Installing 'GioSharp 3.22.24.37'.
Successfully installed 'GioSharp 3.22.24.37'.
Installing 'AtkSharp 3.22.24.37'.
Successfully installed 'AtkSharp 3.22.24.37'.
Installing 'CairoSharp 3.22.24.37'.
Successfully installed 'CairoSharp 3.22.24.37'.
Installing 'PangoSharp 3.22.24.37'.
Successfully installed 'PangoSharp 3.22.24.37'.
Installing 'GdkSharp 3.22.24.37'.
Successfully installed 'GdkSharp 3.22.24.37'.