I have tried from my office it show available download site. Then I used same installer (setup-x86_64.exe) at home it not show anything. Both my pc (office and home) i set up go
I do not have admin privileges on this windows 10 host, but this worked:
setup-x86_64.exe -B -O -s http://mirror.clarkson.edu/cygwin
which allowed me to install cygwin from that one mirror site.