Ultimate Java part 1 - download files question

Hey all, so I just got this and started going through Ultimate Java 1.

I am using Eclipse instead of IntelliJ (Eclipse is what my employer uses so thats what im trying to get used to…and admittedly might be part of the issue)

But at the end of “Getting Started” you get a source code download. Which im feeling was probably needed in the next part as he was referencing some classes that I did not have set up. Problem is I am not seeing an instructions on what do with the files I have downloaded.

Was wondering if someone could give me a hand or at least point me to what I missed.