fix(windows): Resolve broken installation directory handling in MSI & NSIS, preventing duplicate installations during updates (#12365)

Author: don41382

.changes/fix-bundler-msi-install-dir-lookup.md

@@ -0,0 +1,5 @@
+---
+tauri-bundler: 'patch:bug'
+---
+
+Fixed an issue that caused the `.msi` installer not to lookup the `INSTALLDIR` set in the `nsis` installer.

crates/tauri-bundler/src/bundle/windows/msi/main.wxs

@@ -70,9 +70,12 @@
         <Property Id="ARPURLUPDATEINFO" Value="{{homepage}}"/>
         {{/if}}
 
-        <!-- initialize with previous InstallDir -->
         <Property Id="INSTALLDIR">
-            <RegistrySearch Id="PrevInstallDirReg" Root="HKCU" Key="Software\\{{manufacturer}}\\{{product_name}}" Name="InstallDir" Type="raw"/>
+          <!-- First attempt: Search for "InstallDir" -->
+          <RegistrySearch Id="PrevInstallDirWithName" Root="HKCU" Key="Software\\{{manufacturer}}\\{{product_name}}" Name="InstallDir" Type="raw" />
+
+          <!-- Second attempt: If the first fails, search for the default key value (this is how the nsis installer currently stores the path) -->
+          <RegistrySearch Id="PrevInstallDirNoName" Root="HKCU" Key="Software\\{{manufacturer}}\\{{product_name}}" Type="raw" />
         </Property>
 
         <!-- launch app checkbox -->