Upgrade detection properties for WiX (not tested but looks like a handy thing to have). I'm actually thinking this might make more sense in a Fragment instead of Include. based on: http://code.dblock.org/msi-property-patterns-upgrading-firstinstall-and-maintenance#comment-695361597

DetectUpgrade.wxi

<?xml version="1.0" encoding="utf-8"?>
<Include xmlns="http://schemas.microsoft.com/wix/2006/wi">
  <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." Schedule="afterInstallInitialize"/>

  <SetProperty Id="FirstInstall" After="FindRelatedProducts" Value="true">
    NOT Installed AND NOT WIX_UPGRADE_DETECTED AND NOT WIX_DOWNGRADE_DETECTED
  </SetProperty>

  <SetProperty Id="Upgrading" After="SetFirstInstall" Value="true">
    WIX_UPGRADE_DETECTED AND NOT (REMOVE="ALL")
  </SetProperty>

  <SetProperty Id="RemovingForUpgrade" After="RemoveExistingProducts" Sequence="execute" Value="true">
    (REMOVE="ALL") AND UPGRADINGPRODUCTCODE
  </SetProperty>

  <SetProperty Id="Uninstalling" After="SetUpgrading" Value="true">
    Installed AND (REMOVE="ALL") AND NOT (WIX_UPGRADE_DETECTED OR UPGRADINGPRODUCTCODE)
  </SetProperty>

  <SetProperty Id="Maintenance" After="SetUninstalling" Value="true">
    Installed AND NOT Upgrading AND NOT Uninstalling AND NOT UPGRADINGPRODUCTCODE
  </SetProperty>
</Include>