I want to install ArchLinux. The instructions say that I need to have Internet access after installing the core packages. But the problem is that I access Internet in a controlled environment where I need to first authenticate through a captive portal. The captive portal requires a modern GUI browser. And I can't have that untill I install it from repositories. That's a big catch.

Is there any way to install Arch Linux with a desktop environment (I prefer KDE) without the Internet connection. This would be great for people who do not have broadband too.

First install the core packages from the core image ( http://www.archlinux.org/download/ .)

Then you could use a LiveCD ( such as Ubuntu or Fedora ) to chroot into the arch install and update it from there.