Hi there, you should be able to install IRIS from the following link:
https://download.intersystems.com/download/login.csp
To get started with learning, this link would be very helpful:
https://learning.intersystems.com/totara/dashboard/index.php

If you create an account, you will be able to see a whole lot of dashboard to help you getting started.
https://learning.intersystems.com/totara/dashboard/index.php