To use the app correctly, you'll need to have the companion app for Windows installed (it's also available on Uptodown). You can then install the ROM on your Android device while it's connected to your computer via USB.
CyanogenMod offers a series of additional features for Google's original firmware. To start, CyanogenMod will (in theory) help to improve your device's performance and reliability in comparison with official versions of the software.
Other new features include Bluetooth Low Energy and support for OpenGL ES 3.0.
CyanogenMod Installer is an intriguing app for anyone who wants to install the CyanogenMod ROM without having to root their device or perform any other complicated operations.