Template Wizards, IWizard Interface - GetService?

Is that a System.IServiceProvider, or is it in another namespace?

I'm just saying because i have seen a lot with not actual answers. give me nuget packages and actual code, not solutions that involve 3rd party answers that i have to figure out what is meant.

In the context of an IWizard interface, you can access an IServiceProvider in order to get a reference to the Nuget.VisualStudio objects using the following steps:

In the IWizard.RunStarted method, you can access the IServiceProvider by calling the GetService method of the DTE2 object passed to the method.
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    public void RunStarted(object automationObject, Dictionary<string, string> replacementsDictionary, WizardRunKind runKind, object[] customParams)
    {
        _dte = (DTE2)automationObject;
        _serviceProvider = (IServiceProvider)_dte;
    }
Once you have the IServiceProvider, you can use it to get a reference to the Nuget.VisualStudio objects you need. For example, to get a reference to the INuGetPackageManager object, you can use the following code:
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    var nugetPackageManager = (INuGetPackageManager)_serviceProvider.GetService(typeof(INuGetPackageManager));
Similarly, you can get the reference to other Nuget.VisualStudio objects like IVsPackageInstaller, IVsPackageInstallerServices, IVsPackageInstallerEvents, etc by calling the GetService method with the appropriate type.
It's important to note that the IServiceProvider is the way to get access to the Visual Studio services in your extension, and the Nuget.VisualStudio objects are part of the Visual Studio services so it's a way to access them.