From e80beccfe44446ce760635081e2475cb5b350774 Mon Sep 17 00:00:00 2001
From: K4sum1 <k4sum1@eclipse.cx>
Date: Mon, 24 Mar 2025 14:21:31 -0700
Subject: [PATCH] Revert "Issue #1229 - Remove fallback for $INSTDIR"

This reverts commit c87432ab7e40ac646c311beebaa1e7b92a724280.
---
 toolkit/mozapps/installer/windows/nsis/common.nsh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/toolkit/mozapps/installer/windows/nsis/common.nsh b/toolkit/mozapps/installer/windows/nsis/common.nsh
index 0016b7eeb5..44b59a5002 100644
--- a/toolkit/mozapps/installer/windows/nsis/common.nsh
+++ b/toolkit/mozapps/installer/windows/nsis/common.nsh
@@ -5587,6 +5587,21 @@
       StrCpy $INSTDIR "$R9"
 !endif
 
+      ; If the user doesn't have write access to the installation directory set
+      ; the installation directory to a subdirectory of the All Users application
+      ; directory and if the user can't write to that location set the installation
+      ; directory to a subdirectory of the users local application directory
+      ; (e.g. non-roaming).
+      ${CanWriteToInstallDir} $R9
+      StrCmp "$R9" "false" +1 finish_check_install_dir
+
+      SetShellVarContext all      ; Set SHCTX to All Users
+      StrCpy $INSTDIR "$APPDATA\${BrandFullName}\"
+      ${CanWriteToInstallDir} $R9
+      StrCmp "$R9" "false" +2 +1
+      StrCpy $INSTDIR "$LOCALAPPDATA\${BrandFullName}\"
+
+      finish_check_install_dir:
       IfFileExists "$INSTDIR" +3 +1
       Pop $R9
       Return