To share without upgrading:

: Access to Prezi’s signature non-linear interface where you can move freely between ideas rather than following static slides.

: Presentations are saved publicly, allowing you to share links for anyone to view on the web. Important Limitations Guide to Prezi plans

Create a burner email → new Prezi account → upload there → share link. If someone finds it, they can’t trace to you. Not perfect, but free.

Not directly possible. But if you just need the content: