Yeah, the forum can get confusing. Core is not a device or a third-party integration . It's a community – created smart app. So Core posts don't go under devices.
Actually, you'll get the fastest answer to Core Installation questions in the Core thread. That's where the core experts hang out, and they'll be glad to help.
Whenever you have problems installing custom code, go back to the original thread where you got the code and that's where people will be able to help you.