Which is trivial. For all versions of Visual Studio it's has always been in the same location. They changed the directory structure somewhat around 2017 but it was a minor change.

Also, if you want to run that command you need to run it from the developer command prompt. Otherwise it's location isn't in your path but like I said this script is always in the same location and what it does is that it sets up the environment for you and it's configurable via parameters.