diff --git a/CHANGELOG.md b/CHANGELOG.md
index e1f6e27..3f7eef5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,14 +5,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [1.0.11] - 2026-06-04
+## [1.0.12] - 2026-06-04
 
 ### 新功能
 - Windows 客户端改为提供安装程序（Inno Setup 打包的 `jiu-windows-x64-setup.exe`，含中文向导、桌面/开始菜单快捷方式、卸载项），不再是解压版 zip
 
 ### 修复
 - 修复客户端「无法安全下载」：下载地址从内网 HTTP Forgejo（`http://192.168.3.200:3000`，公网不可达且被浏览器拦截）改为同源 HTTPS `https://jiu.51yanmei.com/downloads/...`，Windows、macOS 均生效
-- 修复 Windows runner 安装 Inno Setup 失败：改用健壮的 `install-innosetup.ps1`（校验下载大小 + 检查安装退出码 + 双 Program Files 目录定位 ISCC），替代会静默成功但实际没装上的内联命令
+- 修复 ISCC 编译报「more than one script filename」：调用 Inno Setup 时关闭 Git Bash 的 MSYS 参数路径转换，避免 `/D` 定义参数被改写
 - 部署时将最新安装包发布到 web 服务（`/opt/jiu/downloads/`，nginx `/downloads/` 提供），仅保留最新版本（清旧放新）
 
 ## [1.0.9] - 2026-06-04
diff --git a/scripts/ci/compile-windows.sh b/scripts/ci/compile-windows.sh
index 826e3ec..a2becf2 100755
--- a/scripts/ci/compile-windows.sh
+++ b/scripts/ci/compile-windows.sh
@@ -60,7 +60,10 @@ fi
 cp deploy/windows/jiu-installer.iss "${BUILD_ROOT}/jiu-installer.iss"
 mkdir -p "${BUILD_ROOT}/dist"
 echo "==> building installer with Inno Setup (version ${VER})"
-"$ISCC" \
+# MSYS_NO_PATHCONV / MSYS2_ARG_CONV_EXCL disable Git Bash's automatic conversion
+# of /-leading args into Windows paths, which otherwise mangles ISCC's /D defines
+# (turning them into extra "script filenames").
+MSYS_NO_PATHCONV=1 MSYS2_ARG_CONV_EXCL='*' "$ISCC" \
   "/DAppVer=${VER}" \
   "/DSrcDir=C:\\jiu-build\\client\\build\\windows\\x64\\runner\\Release" \
   "/DOutDir=C:\\jiu-build\\dist" \
diff --git a/scripts/ci/install-innosetup.ps1 b/scripts/ci/install-innosetup.ps1
index 11f4f91..f1070e5 100644
--- a/scripts/ci/install-innosetup.ps1
+++ b/scripts/ci/install-innosetup.ps1
@@ -23,9 +23,14 @@ Write-Output "Downloaded $size bytes"
 if ($size -lt 1000000) { throw "Downloaded file too small ($size bytes) - not a valid installer" }
 
 Write-Output "Installing silently..."
-$p = Start-Process -FilePath $out -ArgumentList '/VERYSILENT','/SUPPRESSMSGBOXES','/NORESTART','/SP-','/NOICONS' -Wait -PassThru
+$log = Join-Path $env:TEMP 'innosetup-install.log'
+$p = Start-Process -FilePath $out -ArgumentList '/VERYSILENT','/SUPPRESSMSGBOXES','/NORESTART','/SP-','/NOICONS',"/LOG=$log" -Wait -PassThru
 Write-Output "Installer exit code: $($p.ExitCode)"
-if ($p.ExitCode -ne 0) { throw "Inno Setup installer failed with exit code $($p.ExitCode)" }
+if ($p.ExitCode -ne 0) {
+  Write-Output "----- install log tail -----"
+  if (Test-Path $log) { Get-Content $log -Tail 40 | ForEach-Object { Write-Output $_ } }
+  throw "Inno Setup installer failed with exit code $($p.ExitCode)"
+}
 
 foreach ($c in $candidates) {
   if (Test-Path $c) { Write-Output "ISCC installed: $c"; exit 0 }