I’m using the simple version of UE4 (no source code) and, after almost two days of struggling, I managed to figure out how to install Emscripten.
First problem comes here: last available version is 1.30.0. After updating, installing and activating its latest versions, the route suggested in your documentation doesn’t exist. the most similar thing is this one: “C:/Program Files/Emscripten/emscripten/tag-1.34.1”.
Second problem comes when packaging it: Surprisignly the previous route allows me to compile the project, but once done, when launched locally I get this awesomely descriptive error on chrome and firefox: error: script error, and this one when launched remotely: Error: TypeError: Module.getMemory is not a function
You can check it here: immersive.es/demos/europerio/