Blazor Component Installation

Trying to install the components using the "Get Started" instructions.
My project is a Blazor Server App. I updated the solution with the instructions for all 6 steps and tried to build it. Below is the first failure I received.

step1 seemed to work fine
step 2 worked
step 3 failed

----- Step 3 instructions

3. Set the themelink

Open the App.razor file of your application. Add this code within the <head> element:

<RadzenTheme Theme="material" @rendermode="InteractiveAuto" />

My app.razor file didn't have a head element so I added:
head>
RadzenTheme Theme="material" @rendermode="InteractiveAuto" />
/head>
to the front of the file as the first 3 lines. (I removed the < char so it would display)

Later I got this error message when I tried to build my project:

Severity Code Description Project File Line Suppression State
Error (active) CS0103 The name 'InteractiveAuto' does not exist in the current context Traffic Pgm (Blazor) K:\Visual Studio 2022\Projects\Projects Traffic\Traffic Pgm (Blazor)\Traffic Pgm (Blazor)\App.razor 2

Later in step 6 the compiler again complained about "InteractiveAuto"

This means your app isn't created with the "new" rendering modes (it was probably created before .NET 8). In that case follow the instructions for .NET 7 or .NET 6 (you have to update either _Host.cshtml or _Layout.cshtml).