Cannot use OAuth2 due to unexpected fields

My question: I am going through a Spring Framework course and the instructor uses Postman to hit a local configured OAuth 2.0 server. His version of Postman is older than what I have, though (I have 10.13.0 for Windows) and does not have the Callback URL, Authorize using browser, or Auth URL fields. Postman will not let me leave the first or third fields blank, returning an error: “Error: Invalid host for auth URL.”. How can I continue using Postman for this? Maybe I could use an old version, but I can’t find anywhere to download one

I’ve already tried: using the same URL for both Auth URL and Access Token URL.