Eu tenho a seguinte configuração e ainda não consegui adicionar bibliotecas mvmcross ao meu projeto:

Atualização 3 do VS2013Gerenciador de Pacotes Nuget 2.8.50313.46Perfil PCL 158 (eu também tentei outro como 78, etc)

O registro de instalação está abaixo:

Attempting to resolve dependency 'MvvmCross.HotTuna.StarterPack (≥ 3.2.1)'.
Attempting to resolve dependency 'MvvmCross.HotTuna.MvvmCrossLibraries (≥ 3.2.1)'.
Attempting to resolve dependency 'MvvmCross.HotTuna.CrossCore (≥ 3.2.1)'.
Attempting to resolve dependency 'MvvmCross.PortableSupport (≥ 3.2.1)'.
Installing 'MvvmCross.PortableSupport 3.2.1'.
Successfully installed 'MvvmCross.PortableSupport 3.2.1'.
Installing 'MvvmCross.HotTuna.CrossCore 3.2.1'.
Successfully installed 'MvvmCross.HotTuna.CrossCore 3.2.1'.
Installing 'MvvmCross.HotTuna.MvvmCrossLibraries 3.2.1'.
Successfully installed 'MvvmCross.HotTuna.MvvmCrossLibraries 3.2.1'.
Installing 'MvvmCross.HotTuna.StarterPack 3.2.1'.
Successfully installed 'MvvmCross.HotTuna.StarterPack 3.2.1'.
Installing 'MvvmCross 3.2.1'.
Successfully installed 'MvvmCross 3.2.1'.
Adding 'MvvmCross.PortableSupport 3.2.1' to ClassLibrary1.
Uninstalling 'MvvmCross.PortableSupport 3.2.1'.
Successfully uninstalled 'MvvmCross.PortableSupport 3.2.1'.
Install failed. Rolling back...
Could not install package 'MvvmCross.PortableSupport 3.2.1'. You are trying to install this package into a project that targets 'portable-net45+win+wp80+Xamarin.iOS10+MonoAndroid10+MonoTouch10', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.