diff --git a/install.ps1 b/install.ps1
deleted file mode 100644
index 9bc488d..0000000
--- a/install.ps1
+++ /dev/null
@@ -1,66 +0,0 @@
-[CmdletBinding()]
-param()
-
-$ErrorActionPreference = 'Stop'
-$ProgressPreference = 'Continue'
-$tempFile = $null
-
-function Get-Architecture {
-    $arch = if ($env:PROCESSOR_ARCHITEW6432) { $env:PROCESSOR_ARCHITEW6432 } else { $env:PROCESSOR_ARCHITECTURE }
-    switch ($arch.ToLower()) {
-        'amd64' { 'amd64' }
-        'x86' { throw 'Unsupported architecture: x86 (64-bit Windows is required).' }
-        'arm64' { 'arm64' }
-        'aarch64' { 'arm64' }
-        default { throw "Unsupported architecture: $arch" }
-    }
-}
-
-function Write-Step {
-    param([string] $Status, [int] $Percent)
-    Write-Progress -Activity 'Installing codex-wrapper' -Status $Status -PercentComplete $Percent
-    Write-Host $Status
-}
-
-try {
-    Write-Step 'Detecting CPU architecture...' 5
-    $arch = Get-Architecture
-    $url = "https://github.com/cexll/myclaude/releases/latest/download/codex-wrapper-windows-$arch.exe"
-
-    $tempFile = Join-Path ([IO.Path]::GetTempPath()) "codex-wrapper-$arch.exe"
-    $homeBin = Join-Path $HOME 'bin'
-    $destination = Join-Path $homeBin 'codex-wrapper.exe'
-
-    [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
-
-    Write-Step "Downloading codex-wrapper from $url ..." 25
-    Invoke-WebRequest -Uri $url -OutFile $tempFile -UseBasicParsing -ErrorAction Stop
-
-    Write-Step "Installing to $destination ..." 65
-    New-Item -ItemType Directory -Path $homeBin -Force | Out-Null
-    Move-Item -LiteralPath $tempFile -Destination $destination -Force
-
-    Write-Step 'Verifying installation...' 90
-    & $destination --version | Out-Null
-
-    Write-Step 'codex-wrapper installed successfully.' 100
-    Write-Progress -Activity 'Installing codex-wrapper' -Completed -Status 'Done'
-    Write-Host "Installed to $destination"
-
-    $normalizedBin = ($homeBin.TrimEnd('\') -replace '/','\').ToLower()
-    $pathEntries = ($env:PATH -split ';') | Where-Object { $_ } | ForEach-Object { ($_ -replace '/','\').TrimEnd('\').ToLower() }
-    if (-not ($pathEntries -contains $normalizedBin)) {
-        Write-Warning "$homeBin is not in your PATH."
-        Write-Host 'Add it permanently with:'
-        Write-Host "  [Environment]::SetEnvironmentVariable('PATH', '$homeBin;' + [Environment]::GetEnvironmentVariable('PATH','User'), 'User')"
-        Write-Host 'Then restart your shell to pick up the updated PATH.'
-    }
-} catch {
-    Write-Progress -Activity 'Installing codex-wrapper' -Completed -Status 'Failed'
-    Write-Error "Installation failed: $($_.Exception.Message)"
-    exit 1
-} finally {
-    if ($tempFile -and (Test-Path $tempFile)) {
-        Remove-Item -LiteralPath $tempFile -Force -ErrorAction SilentlyContinue
-    }
-}
diff --git a/install.py b/install.py
index 281b06c..65f1a22 100644
--- a/install.py
+++ b/install.py
@@ -285,6 +285,8 @@ def op_run_command(op: Dict[str, Any], ctx: Dict[str, Any]) -> None:
         env[key] = value.replace("${install_dir}", str(ctx["install_dir"]))
 
     command = op.get("command", "")
+    if sys.platform == "win32" and command.strip() == "bash install.sh":
+        command = "cmd /c install.bat"
     result = subprocess.run(
         command,
         shell=True,