Fix for Bug:16053094

      Registry redirection was improper and hence not able to pick the value for the OLDERVERSION property. as a result in the install upgrade dialog null value wa being passed.

packaging/WiX/mysql_server.wxs.in

@@ -83,13 +83,25 @@
           Name="InstallLocation"
           Type="raw" />
     </Property>
+    <?if @Platform@ != "x64" ?>
         <Property Id="OLDERVERSION"> 
           <RegistrySearch Id="FindOlderVersion"
             Root="HKLM"
+            Win64 = "no"
             Key="Software\Microsoft\Windows\CurrentVersion\Uninstall\[OLDERVERSIONBEINGUPGRADED]"
             Name="DisplayVersion"
             Type="raw" />
         </Property>
+    <?else ?>
+        <Property Id="OLDERVERSION"> 
+          <RegistrySearch Id="FindOlderVersion"
+            Root="HKLM"
+            Win64 = "yes"
+            Key="Software\Microsoft\Windows\CurrentVersion\Uninstall\[OLDERVERSIONBEINGUPGRADED]"
+            Name="DisplayVersion"
+            Type="raw" />
+        </Property>
+    <?endif ?>
     <Property Id="DATADIR">
       <RegistrySearch Id="FindDataDir"
           Root="HKLM"