You can download demo versions with limited functionality here, when purchasing a copy you will
get a registration code to unlock the limitation.
Observe that for using the plug-ins you will need a host (wave-editor) supporting DirectX based audio plug-ins
e.g. Sonar (Cakewalk), Wavelab (Steinberg), Sound Forge (Sonic Foundry) or CoolEdit Pro (Syntrillium).