>For example when I make an install cd of payroll system and install it on
>a computer, everything is fine. Then when I make another install cd for accounts
>and try to install it on the same computer, an error comes up and asks me to
>remove the previous software to install the accounts program. I have read the
>help files and found out that I have to change the version number and upgrade
>number. Do I have to change these numbers everytime I make an install cd or is
>there a better way ???

It sounds to me like this is something that would be handled with different "features", but I'm not sure if that's correct. You might want to go over to the Installshield forums at http://community.installshield.com/ and see what they have to say.