C#: Using alternate web browser on Win Forms

Hi
I'm tryingg to build a winforms app that uses the built in web browser

On loading a JavaScript hungry HTML5  page I get a number of error boxes similar to the image


Google suggested doing this which didn't work   (Even running the "...\debug\AppName.exe" in admin mode allowed the regestry to be set but failed to load the page correctly

More googling suggested using the nuget package Geckofx60.64


I'm struggling to know how to install this as there are several when searching for Geckofx

I'm also unsure how to run even the simple example given

 [STAThread]
       static void Main(string[] args)
       {
           Xpcom.Initialize("Firefox64");
           var geckoWebBrowser = new GeckoWebBrowser {Dock = DockStyle.Fill};
           Form f = new Form();
           f.Controls.Add(geckoWebBrowser);
           geckoWebBrowser.Navigate("www.google.com");
           Application.Run(f);
       }

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Could someone start me of?

in my App I need to have real browser with at least 1 button that is used after the page loads to analyse the page using xpath queries