Fiz o download indicado no livro mas na hora de executar o código não esta funcionando, estou usando
Microsoft Visual Studio Community 2015 Version 14.0.25425.01 Update 3
Microsoft .NET Framework Version 4.6.01586
Xamarin   4.4.0.34 (3f99c5a) Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android   7.2.0.7 (b16fb82) Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS   10.8.0.174 (7656cc6) Visual Studio extension to enable development for Xamarin.iOS.
São vários erros:
Severity	Code	Description	Project	File	Line	Suppression State
Error	CS0234	The type or namespace name ‘Forms’ does not exist in the namespace ‘Xamarin’ (are you missing an assembly reference?)	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	14	Active
Error	CS0115	‘MainActivity.OnCreate(Bundle)’: no suitable method found to override	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	16	Active
Error	CS0103	The name ‘TabLayoutResource’ does not exist in the current context	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	18	Active
Error	CS0103	The name ‘ToolbarResource’ does not exist in the current context	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	19	Active
Error	CS0234	The type or namespace name ‘Forms’ does not exist in the namespace ‘Xamarin’ (are you missing an assembly reference?)	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	23	Active
Error	CS0103	The name ‘LoadApplication’ does not exist in the current context	Modulo1.Droid	C:\FontesCS\Android\xamarin-casa-do-codigo-master\capitulo 03\Modulo1\Droid\MainActivity.cs	25	Active
Obrigado