Go to the github and scroll down to the downloads area you’ll find “Unstable Master Branch Build” and download that.
There is an installer but I haven’t used it.
It’s a mod, and as such it’s not officially supported by the simulator. Since it piggybacks on the default aircraft instead of creating a completely new one, you can expect every single patch that touches the default a320 to break the mod and require action from its own developers. It’s inevitable.