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CoWPAtty is a wifi password cracking tool. Implementation of a dictionary attack against WPA/WPA2 networks using PSK-based authentication (e.g. WPA-Personal). Many enterprise networks deploy PSK-based authentication mechanisms for WPA/WPA2 since it is much easier than establishing the necessary RADIUS, supplicant and certificate authority architecture needed for WPA-Enterprise authentication. Cowpatty can implement an accelerated attack if a precomputed PMK file is available for the SSID that is being assessed. Download coWPAtty wifi password cracking tool.

It's a pre-built tool for Kali Linux which you can find in the /usr/local/bin directory. It's also available for the windows but it doesn't work as fine as it does in the Kali.

For windows, you can download it from here. As it becomes pre-built in Kali, you do not need to download it. You just have to follow the path /usr/local/bin directory to find it in your Kali Linux OS.