find your Python version by python --version mine is 3.7.3 for example
the easiest way to check either you have 64 or 32 Python just open it in the terminal:

find the appropriate .whl file from here, for example mine is PyAudio‑0.2.11‑cp37‑cp37m‑win_amd64.whl, and download it.
go to the folder where it is downloaded for example cd C:\Users\foobar\Downloads
install the .whl file with pip for example in my case:
pip install PyAudio-0.2.11-cp37-cp37m-win_amd64.whl