diff --git a/lib/image/card_image.dart b/lib/image/card_image.dart
index 14b1faf..40459a8 100644
--- a/lib/image/card_image.dart
+++ b/lib/image/card_image.dart
@@ -3,6 +3,13 @@ import 'dart:typed_data';
 
 import 'package:image/image.dart';
 
+/// 纵向卡面 → 横向位图的预旋转方向（Windows Pavo 直打校准常量）。
+///
+/// 实测（2026-09-23 Windows CS-200e）：纵向缓冲 + byOrientation=1 会被 SDK 旋转 90°
+/// 且锚定错位（内容横向贴左、顺时针转卡才可读）。修复=统一预旋转成 1014×642 横向
+/// 位图 + byOrientation=2 打印。此常量定旋转方向：打测试卡若差 90°（顺/逆）就取反。
+const bool pavoPortraitRotateClockwise = true;
+
 /// PNG data URL 解析与像素层转换（Windows PavoApi 直打用）。
 ///
 /// 卡面为 CR-80 @300dpi：横向 1014×642 / 纵向 642×1014，按源图纵横比自动选择；
@@ -20,6 +27,14 @@ class CardImage {
   /// 宽 ≥ 高 = 横向卡面
   bool get isLandscape => width >= height;
 
+  /// 纵向卡面预旋转为横向位图（Windows Pavo 直打用，见 [pavoPortraitRotateClockwise]）。
+  /// 已是横向的原样返回。返回新实例，原实例不变（正/背面各自转换）。
+  CardImage toLandscape() {
+    if (isLandscape) return this;
+    final rotated = copyRotate(_canvas, angle: pavoPortraitRotateClockwise ? 90 : -90);
+    return CardImage._(rotated, rotated.width, rotated.height);
+  }
+
   /// 解析 data:image/png;base64,…（或其他 data URL 形式），缩放到卡面画布并铺白底。
   static CardImage fromDataUrl(String dataUrl) {
     if (dataUrl.trim().isEmpty) {
diff --git a/lib/print/pavo/pavo_backend.dart b/lib/print/pavo/pavo_backend.dart
index 3c3fd14..9b51f89 100644
--- a/lib/print/pavo/pavo_backend.dart
+++ b/lib/print/pavo/pavo_backend.dart
@@ -113,17 +113,22 @@ Future<void> pavoPrintSync({
   }
   final printer = printers.first.toNativeUtf16();
   try {
-    final frontImg = CardImage.fromDataUrl(frontColor);
+    // Windows Pavo 直打方向校准（2026-09-23 实测）：纵向位图 + byOrientation=1 会被
+    // SDK 旋转 90° 且锚定错位；统一预旋转成 1014×642 横向位图后按 byOrientation=2 打印。
+    // 旋转方向常量见 card_image.dart 的 pavoPortraitRotateClockwise（测试卡校准）。
+    final frontImg = CardImage.fromDataUrl(frontColor).toLandscape();
     final frontBgr = frontImg.toBgr24();
-    final Uint8List? frontKGray =
-        frontK != null && frontK.isNotEmpty ? CardImage.fromDataUrl(frontK).toGray8() : null;
+    final Uint8List? frontKGray = frontK != null && frontK.isNotEmpty
+        ? CardImage.fromDataUrl(frontK).toLandscape().toGray8()
+        : null;
     final Uint8List? backBgr;
     final Uint8List? backKGray;
     if (backColor != null && backColor.isNotEmpty) {
-      final backImg = CardImage.fromDataUrl(backColor);
+      final backImg = CardImage.fromDataUrl(backColor).toLandscape();
       backBgr = backImg.toBgr24();
-      backKGray =
-          backK != null && backK.isNotEmpty ? CardImage.fromDataUrl(backK).toGray8() : null;
+      backKGray = backK != null && backK.isNotEmpty
+          ? CardImage.fromDataUrl(backK).toLandscape().toGray8()
+          : null;
     } else {
       backBgr = null;
       backKGray = null;
@@ -136,7 +141,7 @@ Future<void> pavoPrintSync({
       frontK: frontKGray,
       backBgr: backBgr,
       backK: backKGray,
-      isLandscape: frontImg.isLandscape,
+      isLandscape: true,
       copies: copies,
     );
   } finally {
diff --git a/windows/installer.iss b/windows/installer.iss
index de3cb02..be703e5 100644
--- a/windows/installer.iss
+++ b/windows/installer.iss
@@ -55,3 +55,24 @@ Root: HKCU; Subkey: "Software\Microsoft\Windows\CurrentVersion\Run"; ValueType:
 
 [Run]
 Filename: "{app}\{#AppExeName}"; Description: "立即运行 {#AppName}"; Flags: nowait postinstall skipifsilent
+
+; 覆盖安装/卸载前结束正在运行的实例，避免 exe/dll 被占用导致文件替换失败
+[Code]
+procedure TaskkillApp();
+var
+  ResultCode: Integer;
+begin
+  Exec(ExpandConstant('{cmd}'), '/C taskkill /F /IM "{#AppExeName}"', '', SW_HIDE, ewWaitUntilTerminated, ResultCode);
+end;
+
+function PrepareToInstall(var NeedsRestart: Boolean): String;
+begin
+  TaskkillApp();
+  Result := '';
+end;
+
+procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
+begin
+  if CurUninstallStep = usUninstall then
+    TaskkillApp();
+end;