In studio pro you can use the option Run Locally to run your app on your local machine. Do note that it does not contain the data from your free node.
To get to the URL of your free node open your Sprintr environment (https://sprintr.home.mendix.com ) and go to Apps / My Apps. If you click on the app and go to Environments you can View or open your app in eiter studio or studio pro.
You can also download your data here (Backups) and restore that one in your local postgres environment. See also documentation here: https://docs.mendix.com/developerportal/operate/restore-backup#restore-cloud-backup