From 88717a9ed5b5b5ae988eaa779b67ec8103c76cb7 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Thu, 28 Nov 2019 00:28:00 +0000
Subject: [PATCH] AllowSameVersionUpgrades

---
 contrib/msi/build-msi.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/msi/build-msi.sh b/contrib/msi/build-msi.sh
index 72c2c3e7..d179f54b 100644
--- a/contrib/msi/build-msi.sh
+++ b/contrib/msi/build-msi.sh
@@ -95,7 +95,8 @@ cat > wix.xml << EOF
       SummaryCodepage="1252" />
 
     <MajorUpgrade
-      AllowSameVersionUpgrades="yes" />
+      AllowSameVersionUpgrades="yes"
+      DowngradeErrorMessage="A newer version of Yggdrasil is already installed. Please uninstall it first." />
 
     <Media
       Id="1"