Not so correct. Do this instead
You will need to copy the following files into your home assistant configuration directory
alarm.yaml This files stores your alarm configuration. An options page will be created for this file custom_components/alarm_control_panel/bwalarm.py The brains of the operation. This is the logic of the custom alarm system panels/alarm.html This is the interface for the custom alarm component. It’s actually optional as the alarm will function without it but recommended for ease of setup www/alarm/[ALL FILES] These files control how the interface looks and feels www/lib/[ALL FILES] These files add additional functionality to the interface in order to work www/images/ha.png An image file used for the interface log
Get the files to copy by pressing the big green button on the gihub page and choosing “download zip”.
There are actually other files to copy that are left out of the instructions. Read up the thread a bit.