There's more...

There are some details that you don't want to miss.

At the time of writing (that is, early 2021), the Standard Assets package has not been updated for Unity 2021 (it still uses the 2018 version). When using it in recipes, we find that two errors appear, and these need to be resolved before playing your recipe. The solution to resolving these errors is as follows:

In the ForcedReset.cs file, add the following:

// add UI using statement
using UnityEngine.UI;

// change GUITexture to Image
[RequireComponent(typeof (Image))]

In the SimpleActivatorMenu.cs file, add the following: 

// add UI using statement
using UnityEngine.UI;

// change GUIText to TEXT
public Text camSwitchButton;

We would like to thank ktduffyinc_unity and others for posting solutions to these issues on the Unity forums. The full discussion thread can be found at https://answers.unity.com/questions/1638555/guitexture-adn-guitext-are-obsolete-standard-asset.html.

We have also...