Index: setup/Plugins/WtiSetup/Product.wxs
===================================================================
diff -u -rc891c010c2d22c3303983631dac57cf8112837e2 -r6c9fddd2921ed776714942ffe3231d215fdf8bc2
--- setup/Plugins/WtiSetup/Product.wxs	(.../Product.wxs)	(revision c891c010c2d22c3303983631dac57cf8112837e2)
+++ setup/Plugins/WtiSetup/Product.wxs	(.../Product.wxs)	(revision 6c9fddd2921ed776714942ffe3231d215fdf8bc2)
@@ -6,12 +6,12 @@
   <!-- Static variables. -->
   <?include Variables.wxi ?>
   
-	<Product Id="C8F4EE7D-F2BA-4E1E-ABDB-C454FC68E780" Name="$(var.ApplicationFullName)" Language="1043" Version="$(var.FullReleaseVersion)" Manufacturer="!(loc.Manufacturer)" UpgradeCode="8c52b205-2bc3-4281-9d81-080fb1b2105d">
+	<Product Id="*" Name="$(var.ApplicationFullName)" Language="1043" Version="$(var.FullReleaseVersion)" Manufacturer="!(loc.Manufacturer)" UpgradeCode="8c52b205-2bc3-4281-9d81-080fb1b2105d">
 		<Package InstallerVersion="200" Compressed="yes" InstallScope="perMachine" />
     <Media Id="1" Cabinet="WtiFull.cab" EmbedCab="yes"/>
     <Property Id="ARPPRODUCTICON" Value="Wti.ico" />
 
-		<MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeErrorMessage)" />
+    <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeErrorMessage)" AllowSameVersionUpgrades="yes"/>
 
     <!-- Specify default installer UI and which folder the user can configure during setup -->
     <UIRef Id="WixUI_InstallDir"/>