Instead of hunting for a risky serial number for a version of After Effects that is over a decade old, Why Avoid Keygens and Cracks?
A newer 2D animation tool that is excellent for motion graphics. It has a very generous free tier. adobe-after-effects-cs5-5-10-5-1-full-keygen
This is the biggest competitor to After Effects. The "Fusion" page inside DaVinci Resolve is a node-based compositor used in Hollywood films. The base version is 100% free. Instead of hunting for a risky serial number