Not a direct replacement, but Rainmeter can overlay interactive visualizers, sound-reactive equalizers, and animated widgets on your desktop. Some skins (“VisBubble,” “Fountain of Colors”) create water-like or particle effects.
Instead of chasing an obsolete, unsafe registration key, consider these legitimate, up-to-date alternatives: Watery Desktop 3d Registration Key
Most “registration keys” found on forums are either: Not a direct replacement, but Rainmeter can overlay