diff --git a/wix/mackerel-agent.wxs.template b/wix/mackerel-agent.wxs.template
index 322acc6ce..6f4b68dec 100644
--- a/wix/mackerel-agent.wxs.template
+++ b/wix/mackerel-agent.wxs.template
@@ -44,8 +44,8 @@
 
     <InstallExecuteSequence>
       <Custom Action="FillApiKey" Before="StartServices">Not Installed</Custom>
-      <RemoveExistingProducts Before="InstallInitialize" />
     </InstallExecuteSequence>
+    <MajorUpgrade AllowDowngrades="yes" />
 
   </Product>
 </Wix>