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
Had the same error today, my solution was to :
move the setup-x86_64.exe out of the Download folder into e.g. c:\tmp
i think the cygwin setup process has some problems with creating a temporary file in the same directory of its installer due to a lack of permissions and does not show an error message