How extract SUNWexplo.7.1.pkg & SUNWexplu.7.1.pkg from install_stb.sh?

Hi all,

Could please guideas how to extract SUNWexplo.7.2.pkg & SUNWexplu.7.2.pkg from install_stb.sh.

I need to upgrade my Sun Explorer to 7.2 version from 7.1 .

This what written in read me file about its installation:

The Lightweight Availability Collection Tool (LWACT) is no longer installed
by default by the Services Tool Bundle (STB) installer.
To install do:
install_stb.sh [-verbose] -force_install LWACT
I get below error if I try this:
-bash-3.00$ /usr/local/bin/sudo ./install_stb.sh -ext
STB-00010: Incorrect payload check sum
-bash-3.00$

What is the output of

# head -1 install_stb.sh
# file install_stb.sh

?