I downloaded the Nightbot desktop app for windows and installed it. When I try to open it, a window pops up and closes again.
I use x64. My firewall or antivirus isnt blocking the client.
Running it as administrator isnt working,too.
Well unfortunately I have no idea why the app doesn’t properly launch for you. It should work without any action required. You might try upgrading to Windows 10 and seeing if it helps.