diff --git a/local-tool/Makefile b/local-tool/Makefile
index 984894a..546e13d 100644
--- a/local-tool/Makefile
+++ b/local-tool/Makefile
@@ -459,16 +459,38 @@ dmg: wails-macos ## hdiutil UDZO → dist/visiona-local.dmg
 	@file $(DIST)/visiona-local.dmg
 
 exe: wails-windows ## ⚠️ 必須在 Windows 上跑：Inno Setup → dist/visiona-local-*-windows-x64.exe
-	@if ! command -v iscc > /dev/null 2>&1 && ! command -v iscc.exe > /dev/null 2>&1; then \
+	@ISCC_BIN="$$ISCC"; \
+	if [ -z "$$ISCC_BIN" ]; then \
+		if command -v iscc > /dev/null 2>&1; then ISCC_BIN=iscc; \
+		elif command -v iscc.exe > /dev/null 2>&1; then ISCC_BIN=iscc.exe; \
+		else \
+			for p in "/c/Program Files (x86)/Inno Setup 6/ISCC.exe" \
+			         "/c/Program Files/Inno Setup 6/ISCC.exe" \
+			         "/c/Program Files (x86)/Inno Setup 5/ISCC.exe"; do \
+				if [ -f "$$p" ]; then ISCC_BIN="$$p"; break; fi; \
+			done; \
+		fi; \
+	fi; \
+	ISCC_OK=0; \
+	if [ -n "$$ISCC_BIN" ]; then \
+		if [ -e "$$ISCC_BIN" ] || command -v "$$ISCC_BIN" > /dev/null 2>&1; then ISCC_OK=1; fi; \
+	fi; \
+	if [ "$$ISCC_OK" = "0" ]; then \
 		echo ""; \
-		echo "❌ Inno Setup Compiler (iscc) 未安裝"; \
+		echo "❌ Inno Setup Compiler (iscc) 未安裝 / 找不到"; \
+		echo "   已嘗試偵測的路徑："; \
+		echo "     - \$$ISCC 環境變數"; \
+		echo "     - PATH 上的 iscc / iscc.exe"; \
+		echo "     - /c/Program Files (x86)/Inno Setup 6/ISCC.exe"; \
+		echo "     - /c/Program Files/Inno Setup 6/ISCC.exe"; \
 		echo "   請從 https://jrsoftware.org/isdl.php 下載並安裝 Inno Setup 6"; \
-		echo "   安裝後將 iscc.exe 目錄加入 PATH"; \
+		echo "   或設定 ISCC 環境變數指向 ISCC.exe 絕對路徑"; \
 		echo ""; \
 		exit 1; \
-	fi
-	@mkdir -p $(DIST)
-	iscc installer/windows/visiona-local.iss
+	fi; \
+	echo "==> 使用 ISCC: $$ISCC_BIN"; \
+	mkdir -p $(DIST); \
+	"$$ISCC_BIN" installer/windows/visiona-local.iss
 	@echo "==> 產出："
 	@ls -lh $(DIST)/visiona-local-*-windows-x64.exe 2>/dev/null || echo "未找到產出檔"
 
diff --git a/local-tool/scripts/bootstrap-windows.ps1 b/local-tool/scripts/bootstrap-windows.ps1
index 15b371a..cf41c2b 100644
--- a/local-tool/scripts/bootstrap-windows.ps1
+++ b/local-tool/scripts/bootstrap-windows.ps1
@@ -104,22 +104,51 @@ function Convert-ToMsysPath($winPath) {
 }
 $msysPython = Convert-ToMsysPath $realPython
 
-# 找 Inno Setup Compiler (iscc.exe)，winget 裝在 Program Files (x86) 不在 PATH 裡
-$isccCandidates = @(
-    "${env:ProgramFiles(x86)}\Inno Setup 6\iscc.exe",
-    "$env:ProgramFiles\Inno Setup 6\iscc.exe",
-    "${env:ProgramFiles(x86)}\Inno Setup 5\iscc.exe"
-)
-$isccPath = $null
-foreach ($p in $isccCandidates) {
-    if ($p -and (Test-Path $p)) { $isccPath = $p; break }
+# 找 Inno Setup Compiler (ISCC.exe)
+# 重要：檔名是 ISCC.exe（大寫），winget 裝在 Program Files (x86) 不在 PATH 裡
+function Find-Iscc {
+    $candidates = @(
+        "${env:ProgramFiles(x86)}\Inno Setup 6\ISCC.exe",
+        "$env:ProgramFiles\Inno Setup 6\ISCC.exe",
+        "${env:ProgramFiles(x86)}\Inno Setup 5\ISCC.exe"
+    )
+    foreach ($p in $candidates) {
+        if ($p -and (Test-Path $p)) { return $p }
+    }
+    # 從登錄檔找 Inno Setup 的安裝路徑
+    $regPaths = @(
+        'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Inno Setup 6_is1',
+        'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Inno Setup 6_is1'
+    )
+    foreach ($rp in $regPaths) {
+        $item = Get-ItemProperty $rp -ErrorAction SilentlyContinue
+        if ($item -and $item.InstallLocation) {
+            $p = Join-Path $item.InstallLocation 'ISCC.exe'
+            if (Test-Path $p) { return $p }
+        }
+    }
+    # 最後備案：掃 Program Files 底下
+    $found = Get-ChildItem -Path "${env:ProgramFiles(x86)}","$env:ProgramFiles" `
+                           -Filter 'ISCC.exe' -Recurse -ErrorAction SilentlyContinue -Force |
+             Select-Object -First 1
+    if ($found) { return $found.FullName }
+    return $null
+}
+
+$isccPath = Find-Iscc
+if (-not $isccPath) {
+    Log 'Inno Setup 偵測不到，用 winget 重裝一次'
+    winget install -e --id JRSoftware.InnoSetup --accept-source-agreements --accept-package-agreements --force
+    $isccPath = Find-Iscc
 }
 if ($isccPath) {
     Log "偵測到 Inno Setup: $isccPath"
     $msysIsccDir = Convert-ToMsysPath (Split-Path $isccPath -Parent)
+    $msysIsccExe = Convert-ToMsysPath $isccPath
 } else {
-    Log 'WARN: 找不到 Inno Setup（iscc.exe），make exe 步驟會失敗'
+    Log 'WARN: 仍然找不到 Inno Setup（iscc.exe），make exe 步驟會失敗'
     $msysIsccDir = $null
+    $msysIsccExe = $null
 }
 
 # Makefile 需要 bash + make，透過 MSYS2 bash 執行
@@ -136,6 +165,9 @@ $bashParts = @(
 if ($msysIsccDir) {
     $bashParts += "export PATH=`"$msysIsccDir`":`$PATH"
 }
+if ($msysIsccExe) {
+    $bashParts += "export ISCC=`"$msysIsccExe`""
+}
 $bashParts += 'make vendor-python-windows vendor-wheels-windows vendor-ffmpeg-windows vendor-ytdlp-windows'
 $bashParts += 'make payload-windows'