Nectar 4 includes the same pitch correction engine but within a full mixing suite.
Because this software is no longer in active production, your download options depend on whether you already own a license or are looking for a new one.
The centerpiece of the bundle, this VST/AU/RTAS plugin provided the iconic "hard" pitch correction sound. It featured a simple Hardness/Softness
There are two main reasons for this discontinuation:
Since the original plugin is discontinued, modern producers typically achieve this sound using newer, more powerful alternatives: Legacy Products - iZotope
Technically, . iZotope officially discontinued the T-Pain Effect several years ago.