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I'd like to run NASA's Rocket Modeler on my laptop.

I see from the NASA webpage https://www1.grc.nasa.gov/wp-content/plugins/cheerpj-integration/lib/applets/RocketModeler/Rocket.html that they use cheerpj. I installed CheerpJ Applet Runner from the Chrome Webstore. When I download the ZIP https://www.grc.nasa.gov/www/k-12/airplane/javplts/rocket3/RocketModeler.zip, unzip it, and run a local webserver https://crates.io/crates/https for the unzipped directory, navigating there CheerpJ Applet Runner shows "runtime ready", then "loading", and then nothing. How can I get it to work?