Postman update / steps doesn't match

I think the Postman platform API has been updated since the instructions to install and use it doesn’t match.

When you install it, it comes in a Exe format, there is no folder so it’s not possible to go with the terminal and install the packages using Node;

The instruction for test the http requests (as localhost:4000/users, for example) doesn’t work.
It shows the error: " Error: connect ECONNREFUSED ".

But i tried to make it using the database example in Postman website, (“” so you can follow it to understand the steps.