I've just pushed a new build that includes some UE4 Prerequisites, please let me know if this resolves the issue.
I can’t speak for OP, but my copy isn’t running either. When I try to open it I get the little “busy” cursor for a second and then nothing happens. I tried installing the new updated version and my antivirus scanned it and said it was okay, but the program itself just doesn’t run. Weird.
I’m running Windows 10 version 2004, if that helps.