I guess that I'll have to have THREE installations of Worms Armageddon on my machine, so yeah. Once RubberWorm and the other WormKit modules are released, I won't need 3.7.2.1 anymore, so I'll remove it, and free some space, which could be used for Version 4. As for my other installation (3.6.31.0), that will be kept until PX is updated or a PX successor is released.