From e482574aaf43bd938c073bdbfcb3aaa36ce48623 Mon Sep 17 00:00:00 2001
From: Armin Schrenk <armin.schrenk@skymatic.de>
Date: Wed, 15 Sep 2021 12:16:25 +0200
Subject: [PATCH] Block windows installation if old innosetup version is
 installed

---
 dist/win/resources/main.wxs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/dist/win/resources/main.wxs b/dist/win/resources/main.wxs
index c639ee589..c1384c2cf 100644
--- a/dist/win/resources/main.wxs
+++ b/dist/win/resources/main.wxs
@@ -47,6 +47,16 @@
     <CustomAction Id="JpDisallowDowngrade" Error="!(loc.DowngradeErrorMessage)" />
     <?endif?>
 
+    <!-- Looking for legacy Cryptomator versions-->
+    <Property Id="OLDEXEINSTALLER">
+      <RegistrySearch Id="InnoSetupInstallation" Root="HKLM" Key="Software\Microsoft\Windows\CurrentVersion\Uninstall\Cryptomator_is1" Type="raw" Name="DisplayName" />
+    </Property>
+    <!-- Block installation if innosetup entry of Cryptomator is found -->
+    <!-- TODO: localize -->
+    <Condition Message="A lower version of [ProductName] is already installed. Uninstall it first and then start the setup again. Setup will now exit.">
+        <![CDATA[Installed OR NOT OLDEXEINSTALLER]]>
+    </Condition>
+
     <!-- Standard required root -->
     <Directory Id="TARGETDIR" Name="SourceDir"/>