The "new" version you think you are getting is often a fake build from 2021. You will miss out on bug fixes, new bone systems, and render engines.
If you need a completely free 2D animation tool right now and cannot afford a CelAction2D license, several excellent open-source and free alternatives can help you practice rigging and 2D animation concepts: celaction 2d free download new
Since there is no public demo, your options for testing the software are limited: CelAction2D pricing - CelAction The "new" version you think you are getting