RE:Vision Effects has robust licensing checks. Even if a crack works initially, it often fails mid-render, leaving a giant red "X" over your footage that you cannot remove.
It sounds like you're looking for information on two different things: the plugin for After Effects and a paper (possibly a research paper or an overlay effect). 1. Twixtor Plugin for After Effects
Searching for a "crack" for the for After Effects may seem like a quick way to save money, but it carries significant technical, legal, and security risks. Twixtor is a professional-grade time-remapping tool developed by RE:Vision Effects that uses complex motion estimation to create smooth slow-motion or fast-motion effects. The Dangers of Using "Cracked" Plugins
: Allows you to smoothly transition from normal speed to extreme slow motion.
RE:Vision Effects (the creators of Twixtor) frequently updates the plugin to handle new GPU drivers and AE versions. A crack is a "frozen" version of the code. You lose out on: GPU Acceleration: