Install Xamarin on Visual Studio 2015 with Xamarin on Visual Studio 2013 already installed

Question

I have Xamarin installed on the Visual Studio 2013 on Windows Operating System. It works fine.

There is Xamarin tools in VS2013 as follows:

My problem

Answer 1

Before any install or uninstall actions. Try open some sample Xamarin project, in most cases during opening project in VS 15, it will show you, what needs to be installed or what is missing / corrupted.

Xamarin samples