If the owner of the Prezi blocked external downloading or cloning, you can manually capture the visuals.
If you only need the content and don't need the zooming animations, you can export the presentation as a PDF directly from the dashboard or editor. Hover over the presentation thumbnail →right arrow click the three dots (⋮) →right arrow select Download PDF .
You get a standalone file (.exe or .app) that doesn't require a browser. The Catch:
Select to save it as a standalone .EXE (Windows) or .ZIP (Mac) file.