I use the followin code, and associated customaction to detect previous
versions of the product.It warns the user about the previous version and
stops the install.But when i try to do a silent install,it doesn't seem to
check for the existing versions and gets installed parallelly.any help?

<Upgrade Id="CBC35353-1EEF-4BF5-93E9-937889318F09">
      <UpgradeVersion OnlyDetect="yes" Property="PATCHFOUND" Minimum="1.0"
Maximum="2.0" IncludeMaximum="yes" IncludeMinimum="yes"/>
 </Upgrade>
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