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Level 5

Urgent:Another version of this product is already installed

Please guide me on below issue.

I have Basic MSI installer-test1.ism
which supports multiple instance of 10. I have installed it on my machine.

and there is one more Basic MSI installer file test2.ism.

Actually,what i want to achieve is that if i installed test1 on my machine.
and want to upgrade this installation with test2 with no change in of icon.

That mean same icon will be used to launch test1.

but when I try to install test2 on machine when already test1 is installed.
I am getting following error.

[Window Title]
Windows Installer

[Main Instruction]
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.


How I can get rid of this issue?

DO i need to implement Multi Instance support for test2 ?

Is there any need of product code/package code change?

I am newbie to Install shield.

I am using IS 2011 Hotfix A Professional Edition .

Please let me know if you need any information.
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(2) Replies
Level 8

You need to configure:
Major OR Minor upgrade

Minor Upgrade can be packaged as:
Full msi or msp PATCH.

The keywords for the purpose would be:

The abovementioned public properties need to be mentioned in the command-line to get rid of the error in case you want to stick to your msi package.

Something like:

Or you would need a bootstrapper to pass REINSTALL and REINSTALLMODE to the msi.

You can avoid this by creating a Major Upgrade or a patch.
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Level 5

Thank You MSIYER,

I am not aware of this.
I am reading help files from Install Shield and will back to you if I don't find solution.

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