In the Android modding community, "E.E.S" typically refers to a specific modifier or a release group known for cracking and tweaking Android applications. The "App Cloner Mod by E.E.S" usually refers to a "premium unlocked" version of a popular cloning application—most likely a modified version of (originally developed by AppListo) or a similar competitor.
If you still choose to install the , here is how it is typically done: app cloner mod by e.e.s