Isn't it just static files? Use a cdn like cloudflare or AWS CloudFront or depending on size - if you can break it into chunks of like 50mb each, GitHub pages (free)

200 people or 100k people wouldn't matter then, it'll be cached.

It will also make the download based almost entirely on client download speed.

is 200 a lot of concurrent people? What is required from the server in order to render the demo, can't most of the work be pushed to the edge devices?