Unable to install a 'Minor Upgrade' msi in Installshield X?

Hmmm..Again its the same issue in Installshield..I am using Installshield X version and I am getting the error when I try to install a minor upgraded version of MSI.I Googled a lot followed the steps to perform a minor upgrade.

*STEPS I FOLLOW *

As this is a minor upgrade (Jus a file updation) I changed the Package Code(generated a new one) and Product Version (incremented 1 from the previous) !!

*ERROR I GET *

I get an error "Another version of this product is already installed.Installation of this version cannot continue.To configure or remove the existing version of this product, Use Add/Remove programs on the control panel"

I FOUND THIS AS A COMMON ERROR AND THERE WAS A SOLUTION FROM THE BELOW GIVEN LINK http://www.msigeek.com/1256/how-do-you-create-a-minor-upgrade-for-an-application-using-installshield

SOLUTION WITHOUT ERROR

I still remember the Upgrade working perfectly few months back for me as I use to get a Pop-up message saying that this a an upgrade... I did not perform any extra commandline statements or any other step expect the Package Code and Product Version

SOLUTION I NEED

Is there any thing to be done oth开发者_StackOverflow社区er than the regular process which I follow to install the new MSI on a system which has the previous version MSI ??

DETAILS TO MAKE IT MORE CLEAR

FIRST MSI Installshield Version - X Product Version - 5.1 Package Code - Same Upgrade Code - Same Product Code - Same Upgrades - Major (The minor upgrade worked for me wid out creating a upgrade for minor)

SECOND MSI Installshield Version - X Product Version - 5.2 Package Code - Generated new Upgrade Code - Same Product Code - Same Upgrades - Major (The minor upgrade worked for me wid out creating a upgrade for minor)

huh..Installshield Pros would have experienced this so replies please !! ;)

Minor upgrades are invoked using the command msiexec /i foo.msi REINSTALL=ALL REINSTALLMODE=vomus. Since you don't want your users to have to type this you need a bootstrapper to do it for you. InstallShield can generate a setup.exe that detects this state and does it for you.