My first guess would be the Active Anticheat might blocks it, because that's the only difference between retail and EuroAion (besides of client version). Run the client without using EuroAion launcher. You won't be able to play then, because it will not let you log in, but we can see if your touchpad works in the main menu or not. If it works, then yes, it's probably the Active Anticheat, if it still not works, then the problem lies somewhere else. A wierd windows bug maybe. It can be many reasons, but you need to debug step by step starting from the major suspects of the issue to random stuff.