silent (night) install

Hi, I am trying to do a silent install of matlab on a remote server with no gui. So I edited the installer_input.txt , adding my key and path to license file. On running

root@braini1:~/mlb# ./install -mode silent -inputFile installer_input.txt

I hit :

Using a File Installation Key requires you run the installer from a MATLAB DVD or from a directory which contains files previously downloaded via the installer.

I downloaded the .iso and mounted it on the server in another directory (which I called iso) and then tried installing with the installfile that has my key etc in it:

root@braini1:~/iso# ./install -mode silent -inputFile   ../mlb/installer_input.txt 
./install: 1: eval: /root/iso/bin/glnxa64/install_unix: Input/output error

1. How would I get this to work 2. Is there some other way to do this than to download the 7Gb .iso?