fix Windows installer Scripts path detection

install.bat

@@ -52,10 +52,10 @@ if %ERRORLEVEL% equ 0 (
 )
 
 REM Step 4: Find the Scripts directory and add to PATH
-for /f "delims=" %%i in ('%PYTHON% -c "import site; print(site.getusersitepackages().replace(chr(92)+chr(39)lib'+chr(92)+'site-packages', chr(92)+'Scripts'))"') do set SCRIPTS_DIR=%%i
+for /f "delims=" %%i in ('%PYTHON% -c "import sysconfig; print(sysconfig.get_path('scripts'))"') do set SCRIPTS_DIR=%%i
 
 if not exist "%SCRIPTS_DIR%\ebuild.exe" (
-    for /f "delims=" %%i in ('%PYTHON% -c "import sys; import os; print(os.path.join(os.path.dirname(sys.executable), chr(39)Scripts'))"') do set SCRIPTS_DIR=%%i
+    for /f "delims=" %%i in ('%PYTHON% -c "import sysconfig; print(sysconfig.get_path('scripts', scheme='nt_user'))"') do set SCRIPTS_DIR=%%i
 )
 
 if exist "%SCRIPTS_DIR%\ebuild.exe" (

tests/unit/test_windows_installer.py

@@ -0,0 +1,94 @@
+import os
+from pathlib import Path
+import re
+import subprocess
+import sys
+
+import pytest
+
+
+INSTALLER = Path(__file__).resolve().parents[2] / "install.bat"
+
+BATCH_COMMAND_PATTERN = re.compile(
+    r'^\s*for /f "delims=" %%i in \(\''
+    r'%PYTHON% -c "(?P<python>.+)"\'\) '
+    r'do set SCRIPTS_DIR=%%i\s*$'
+)
+
+
+def _installer_python_commands():
+    content = INSTALLER.read_text(encoding="utf-8")
+
+    return [
+        line
+        for line in content.splitlines()
+        if '-c "' in line
+    ]
+
+
+def test_embedded_python_commands_are_well_formed():
+    """Installer Python commands must have valid batch and Python syntax."""
+    lines = _installer_python_commands()
+
+    assert lines, "No embedded Python commands found in install.bat"
+
+    for line in lines:
+        match = BATCH_COMMAND_PATTERN.fullmatch(line)
+
+        assert match is not None, (
+            f"Malformed FOR /F Python command in install.bat: {line}"
+        )
+
+        command = match.group("python")
+        compile(command, "<install.bat>", "exec")
+
+
+@pytest.mark.skipif(
+    os.name != "nt",
+    reason="Windows cmd.exe validation",
+)
+def test_embedded_python_commands_execute_in_cmd(tmp_path):
+    """The complete FOR /F commands must execute successfully in cmd.exe."""
+    lines = _installer_python_commands()
+
+    assert len(lines) == 2
+
+    batch_file = tmp_path / "validate_installer_commands.bat"
+
+    script = "\r\n".join(
+        [
+            "@echo off",
+            "setlocal",
+            f'set "PYTHON={sys.executable}"',
+            'set "SCRIPTS_DIR="',
+            lines[0],
+            "if not defined SCRIPTS_DIR exit /b 11",
+            "echo FIRST=%SCRIPTS_DIR%",
+            'set "SCRIPTS_DIR="',
+            lines[1],
+            "if not defined SCRIPTS_DIR exit /b 12",
+            "echo SECOND=%SCRIPTS_DIR%",
+            "endlocal",
+        ]
+    )
+
+    batch_file.write_text(
+        script,
+        encoding="utf-8",
+        newline="",
+    )
+
+    result = subprocess.run(
+        ["cmd.exe", "/d", "/c", str(batch_file)],
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+
+    assert result.returncode == 0, (
+        f"cmd.exe failed\nSTDOUT:\n{result.stdout}\n"
+        f"STDERR:\n{result.stderr}"
+    )
+
+    assert "FIRST=" in result.stdout
+    assert "SECOND=" in result.stdout