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Upgrading

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Anyway, you should use the Upgrade table to detect other versions of the product installed. 

 
 <Upgrade Id="$(var.UpgradeCode)">
       <UpgradeVersion 
           IgnoreRemoveFailure="yes" 
           Language="1033" 
           Maximum="$(var.Version)" 
           IncludeMaximum="no" 
           Minimum="1.0.0.0" 
           MigrateFeatures="no" 
           Property="UPGRADE_VERSION_PROP" />
      <UpgradeVersion 
           Minimum="$(var.Version)" 
           IncludeMinimum="no"
           OnlyDetect="yes" 
           Property="NEWERVERSIONDETECTED" 
           MigrateFeatures="no"/>
 </Upgrade>
 

where $(var.UpgradeCode) is wix preprocessor variable defining the Upgrade code of your product. The NEWERVERSIONDETECTED property will be set (filled with product code of detected installation) if there is newer version of the product already installed. The UPGRADE_VERSION_PROP property will be set (filled with product code of detected installation) if there is older version of the product installed.

For more details see msdn - Upgrade Table http://msdn2.microsoft.com/en-us/library/aa372379.aspx or WiX help.

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