If user has HOME env var, Html5 packaging creates .emscripten folder within the location specified by HOME, not the expected intermediate location(like C:\Program Files\Epic Games\4.13\Engine\Intermediate\Build\HTML5\.emscripten). This causes packaging to fail.
1. Add HOME env var to the PC, and points to some directory
2. Create a new First Person Project
3. Try to create a html5 package
4. packaging fails with C:\Program Files\Epic Games\4.13\Engine\Intermediate\Build\HTML5\.emscripten not found error
Head over to the existingAnswerHub thread and let us know what's up.