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"Another version ... is already installed"

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Posted 30 October 2009 - 14:01

I'm new to Installshield Express 2008, but I cant figure this one out.

Last month I made an install package
product version 1.00.0016
product code {0ABBB43D-9E96-4709-807E-CDCFA258F39A}
upgrade code {3C0EDEFB-12F7-40B1-AAAA-BAAE5ACC60E4}

This month I have made some changes to my application exe, and increased its version from to

I now want to rebuild my installer package, so that existing users will be given an option such as "Do you want to upgrade? yes/no". New users will be allowed to install the product completely, just like normal. How do i do this?

I tried changing the product version, but when i run this, it says "Another version of this product is already installed"... I've also tried changing the product code, but I get the same thing again.

Can anyone help?

Stefan Krueger

Stefan Krueger


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Posted 31 October 2009 - 11:29

You need to add an entry under "previuos version" (not sure what it's called). This will automatically uninstall the previous version. Technically, this is a "major upgrade" and requires that you change the ProductCode and ProductVersion. The version needs to be incremented in any of the first three fields, because Windows Installer ignores the fourth field of the ProductVersion.