It's not clear from your post what problem you are describing. Your title says you have a downloading problem, and your message says it downloaded into your downloads folder. You also don't say what you did in response to the "computer
is scheduled to restart" message. Did you restart it? That would be unrelated to EW, which does not need a reboot for installation. It usually means you have Windows updates or other programs that require a restart.
By the way, I hope you downloaded the final version of EW4, which is free and is not a trial. (The filename has trial in it, but that's a misnomer.)