Because endorphin is difficult to run on modern operating systems without workarounds (like using

NaturalMotion ceased retail sales and support for Endorphin years ago to focus on mobile gaming and their Euphoria integration for AAA studios.

The Internet Archive (archive.org) is a digital library that hosts millions of abandoned software titles. Search for "Natural Motion Endorphin 2.5.2" on the platform. You will find ISO files and ZIP archives uploaded by preservationists. These files are scanned for malware and are generally safe for download.

Hi there,

If you are looking for that specific "natural motion" feel in 3D animation, here are the modern successors and alternatives: Euphoria (NaturalMotion):