This was likely a minor bug. I've uploaded a fixed version. Please re-download and install the plugin. I'll test it again on Windows myself once I install Blender.
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I've already fixed it. I installed Blender automatically using Linux's package manager, and Fedora's Python comes with WebSockets, so I didn't notice this issue. I installed Blender 5.0 using Flatpak, and it's installed and running without problems. I've also removed all extra dependencies. Could you please test it on Windows to see if there's a problem, and let me know as soon as possible? Thank you very much for your feedback.