Hide a pop message while downgrading using Installshield

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I was installing 3.2.0.2 version(older) over 3.2.0.3(latest) to verify downgrade. However I get a pop-up message as The setup will perform an upgrade...., and followed by another pop-up A later version of ....

After the second pop-up, install operation just terminated (which is expected behavior). However, the issue is with first pop-up which shouldn't be displayed while downgrading.

How can I get rid of this first pop-up?

I tried disabling prompt, don't prompt options, but no luck.

I have searched the property manager through string editor as well, but unable to find where is that message is coming from.

Could anyone please help me to get rid of this one?

Thanks in advance

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To be honest, how much of your users will perform a downgrade of your software?

Is it not better to block downgrades?

What I do is showing a message to the user that a newer version is already installed and if he wants to install the older version, he first needs to remove the installed version.