1) detect the old application and set a property;
2) Use that property in a Launch Condition.  Stop the install if present with a 
"Please remove the-old-product first"; else continue with the install.

Unconditionally removing a product without the user's intervention is not 
friendly behavior.

--
John Merryweather Cooper
Jack Henry & Associates, Inc.
Build & Install Engineer - jXchange
Office:  913-341-3434 x791011
jocoo...@jackhenry.com




-----Original Message-----
From: Aled Hughes [mailto:trestlemon...@gmail.com] 
Sent: Tuesday, November 08, 2011 12:29 PM
To: General discussion for Windows Installer XML toolset.
Subject: [WiX-users] New installer uninstalling an old application

As part of my installer I need to uninstall some other application which is 
being superseded, prior to installing the new app. So into my .wxs file I've 
added in:

<Upgrade Id="{UpgradeCode_of_other_application"/>

In the hope that the application will be removed. However, it appears not to 
work. Looking at the generated MSI with Orca the Upgrade table only contains 
the upgrade guid for this installer. The FindRelatedProducts action is in the 
InstallExecuteSequence table.
This is with latest Wix 3.6.

Any ideas on how I should do this?
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