Power up, log into your Raspberry Pi and make sure you are connected to a network. You will reach the commend prompt similar to this:
pi@raspberrypi ~ $
We will download the program into the /home directory (folder for Windows users), but you can download it into any folder of your liking.
Type the following commands and press the enter key at the end of each line:
sudo wget www.privateeyepi.com/downloads/alarm.py
Before you can run the program you need to create a user, password and configure your alarm system. That is what we will do in the next step.