So I'm trying to use RtAudio to read microphone input in real time, but the problem is that when I download the .zip file, I found the header files but there is no .lib files or dll, and I need them Link with my project, where are they?
I'm a beginner in cpp:)
This is the RtAudio https://github.com/thestk/rtaudio
You seem to have downloaded a copy of source code repository. Compiled binaries such libraries are not stored in such repositories. That's why you won't find them there.
In order to get the compiled libraries from the source code, you must compile i.e. build the source code. Each project has their own way of building from source, although there are common patterns. The frontpage that you link to contains instructions on how to build that project. The instructions to build it are under the heading "Building".