why not block a x86 installer on x64 and vice versa ?
When going the way to block a msi in presence of another following
approach might be helpful. Not tested but should illustrate a possible
approach:
<!-- LaunchConditions -->
<Condition Message="X64 version already installed">
<![CDATA[Installed OR X64_MSI_INSTALLED]]>
</Condition>
<Upgrade Id='UpgradeCodeOfX64Package'>
<UpgradeVersion
OnlyDetect='yes'
Property='X64_MSI_INSTALLED'/>
</Upgrade>
where UpgradeCodeOfX64Package is the UpgradeCode GUID of the x64 package.
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