For installing our software we are using installation script. If the installation script getting failed also the final wizard showing the installation process is successful. So how can I change the post installation wizard according to the out put of the script.
What I did was make a variable $HOWEVER_MESSAGE$, and if there was a problem in my various scripts (based on tests of $EXECUTE_STDOUT$ etc.) then I set it to some text about "however there were some errors during install, so please look in the various log files". Then in the text shown when $INSTALL_SUCCESS$ is SUCCESS, I include $HOWEVER_MESSAGE$ at the end, which will be the empty string if there were no errors. (I first tried to set $INSTALL_SUCCESS$ directly but this is apparently a read-only variable.)
