The 'Installing Camelbox' wiki page [1] goes into how to do installs
using a webserver that you set up as a mirror ("Creating a Local
Camelbox Mirror", bottom of the page). That page has screenshots of
the dialogs so you know what to look for during the install process.
You have to install once on a machine that faces the internet to get
the correct set of package files.
You can also download and unpack the package files by hand; you need
to have the tar and lzma binaries on the machine already to do this.
In a command prompt window:
mkdir \camelbox
cd \camelbox
lzma d -so package.file.tar.lzma | tar -xvf
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Thanks,
Brian
[1] http://code.google.com/p/camelbox/wiki/InstallingCamelbox