Of course I already fixed it by emergency way (download, extract, and upload), but I’m still curious. Why I can’t install/update a plugin easily at the moment? (Elementor is 7MB, and still having errors)
Like always elementor isn’t recommend on free hosting. It uses so much I/O processing. So due to large load by the plugin you’ve encountered that error.
502 Bad Gateway error could be caused by a script that’s running too long. Why this happens, or why the process is interrupted, we aren’t even quite sure.