I thought the error produced by following the link to the original author's site was related to the .ua domain and current events, but it turns out the story is

I thought the error produced by following the link to the original author's site was related to the .ua domain and current events, but it turns out the story is evidently more complicated, and seemingly also unresolved since 2018: https://github.com/iCrazyBlaze/Xash3D-Emscripten/issues/1 https://github.com/iCrazyBlaze/Xash3D-Emscripten/issues/1