Install RRC on Linux 32 bit

Hello, I'd like to install RRC 2.0.0.1 on my laptop on Linux Ubuntu 32 bit, but I met a problem.
I followed this guide on the official site, but it doesn't work.

1. Download the Rational Requirements Composer Client and Server .zip files (Part 1 and 2 for the server, Master and Main for the client) from the All Downloads tab.
2. Extract the contents of the downloaded .zip files into a temporary location, so that you have the following directories: RRCS and RRCS_SETUP for the server, and RRCC and RRCC_SETUP for the client.
3. Go to the RRCS_SETUP directory and execute launchpad.exe (on Windows, or launchpad.sh on Linux) to launch IBM Installation Manager v1.3.2., which will install Rational Requirements Composer Server.
4. Go to the RRCC_SETUP directory and execute launchpad.exe to install Rational Requirements Composer Client.

I only need to install the client, because the server one is on my university's server.
I extracted the zip files of the client in the same directory; later, using the terminal, i have used the instruction "chmod +x launchpad.sh", but when I tried to execute the sh file and I pressed the button "install" in the user interface, it returned me (on the terminal):

/bin/bash: /home/fabio/Scrivania/RRCC_SETUP/InstallerImage_linux/install: No such file or directory

I often saw that this error has been found for 64 bit Ubuntu users, but I use Ubuntu LL 10.04 32 bit.
Can somebody help me?
Thanks a lot, Bye.