diff --git a/windows_package/install.bat b/windows_package/install.bat
index 3793e984..4f834ac6 100644
--- a/windows_package/install.bat
+++ b/windows_package/install.bat
@@ -1 +1 @@
-call %~dp0\update.bat
+call "%~dp0\update.bat"
diff --git a/windows_package/iw3-gui.bat b/windows_package/iw3-gui.bat
index f9a794da..8b2c541e 100644
--- a/windows_package/iw3-gui.bat
+++ b/windows_package/iw3-gui.bat
@@ -1,5 +1,5 @@
 @echo off
 
-call %~dp0setenv.bat
-pushd %NUNIF_DIR% && start "" pythonw -m iw3.gui && popd
+call "%~dp0setenv.bat"
+pushd "%NUNIF_DIR%" && start "" pythonw -m iw3.gui && popd
 exit /b 0
diff --git a/windows_package/nunif-prompt.bat b/windows_package/nunif-prompt.bat
index 868e2d32..6d6b5e34 100644
--- a/windows_package/nunif-prompt.bat
+++ b/windows_package/nunif-prompt.bat
@@ -1,5 +1,5 @@
 @echo off
 
-call %~dp0setenv.bat
-cd %NUNIF_DIR%
+call "%~dp0setenv.bat"
+cd "%NUNIF_DIR%"
 call cmd
diff --git a/windows_package/update-installer.bat b/windows_package/update-installer.bat
index 8ef8ae45..afcf1e18 100644
--- a/windows_package/update-installer.bat
+++ b/windows_package/update-installer.bat
@@ -1,10 +1,16 @@
 @echo off
 
 setlocal enabledelayedexpansion
-call %~dp0\setenv.bat
+call "%~dp0\setenv.bat"
 
-copy %NUNIF_DIR%\windows_package\update.bat %~dp0\update.bat
-copy %NUNIF_DIR%\windows_package\setenv.bat %~dp0\setenv.bat
+copy /y "%NUNIF_DIR%\windows_package\setenv.bat" "%~dp0\setenv.bat"
+copy /y "%NUNIF_DIR%\windows_package\update.bat" "%~dp0\update.bat"
+copy /y "%NUNIF_DIR%\windows_package\install.bat" "%~dp0\install.bat"
+
+copy /y "%NUNIF_DIR%\windows_package\nunif-prompt.bat" "%~dp0\nunif-prompt.bat"
+copy /y "%NUNIF_DIR%\windows_package\iw3-gui.bat" "%~dp0\iw3-gui.bat"
+copy /y "%NUNIF_DIR%\windows_package\waifu2x-gui.bat" "%~dp0\waifu2x-gui.bat"
+copy /y "%NUNIF_DIR%\windows_package\waifu2x-web.bat" "%~dp0\waifu2x-web.bat"
 
 pause
 exit /b 0
diff --git a/windows_package/update.bat b/windows_package/update.bat
index 69e6684f..e7998039 100644
--- a/windows_package/update.bat
+++ b/windows_package/update.bat
@@ -1,8 +1,7 @@
 @echo off
 
 setlocal enabledelayedexpansion
-call %~dp0\setenv.bat
-
+call "%~dp0\setenv.bat"
 
 @rem check to make sure the variables are available
 if "%ROOT_DIR%"=="" goto :on_error
@@ -27,15 +26,15 @@ if %ERRORLEVEL% neq 0 (
 
 
 @rem try nunif
-if not exist %NUNIF_DIR% (
-  git clone https://github.com/nagadomi/nunif.git %NUNIF_DIR%
+if not exist "%NUNIF_DIR%" (
+  git clone https://github.com/nagadomi/nunif.git "%NUNIF_DIR%"
   if !ERRORLEVEL! neq 0 goto :on_error
 ) else (
-  git -C %NUNIF_DIR% pull --ff
+  git -C "%NUNIF_DIR%" pull --ff
   if !ERRORLEVEL! neq 0 (
-    git -C %NUNIF_DIR% reset --hard
+    git -C "%NUNIF_DIR%" reset --hard
     if !ERRORLEVEL! neq 0 goto :on_error
-    git -C %NUNIF_DIR% pull --ff
+    git -C "%NUNIF_DIR%" pull --ff
     if !ERRORLEVEL! neq 0 goto :on_error
   )
 )
@@ -44,26 +43,26 @@ if not exist %NUNIF_DIR% (
 echo Install Python Packages...
 python -m pip install --no-cache-dir --upgrade pip
 if %ERRORLEVEL% neq 0 goto :on_error
-python -m pip install --no-cache-dir --upgrade -r %NUNIF_DIR%\requirements-torch.txt
+python -m pip install --no-cache-dir --upgrade -r "%NUNIF_DIR%\requirements-torch.txt"
 if %ERRORLEVEL% neq 0 goto :on_error
-python -m pip install --no-cache-dir --upgrade -r %NUNIF_DIR%\requirements.txt
+python -m pip install --no-cache-dir --upgrade -r "%NUNIF_DIR%\requirements.txt"
 if %ERRORLEVEL% neq 0 goto :on_error
-python -m pip install --no-cache-dir --upgrade -r %NUNIF_DIR%\requirements-gui.txt
+python -m pip install --no-cache-dir --upgrade -r "%NUNIF_DIR%\requirements-gui.txt"
 if %ERRORLEVEL% neq 0 goto :on_error
 
 
 echo Download Models...
-pushd %NUNIF_DIR% && python -m waifu2x.download_models && popd
+pushd "%NUNIF_DIR%" && python -m waifu2x.download_models && popd
 if %ERRORLEVEL% neq 0 goto :on_error
 
-pushd %NUNIF_DIR% && python -m iw3.download_models && popd
+pushd "%NUNIF_DIR%" && python -m iw3.download_models && popd
 if %ERRORLEVEL% neq 0 goto :on_error
 
 
 @rem warmup, create pyc
-pushd %NUNIF_DIR% && python -m iw3.gui --help > nul && popd
+pushd "%NUNIF_DIR%" && python -m iw3.gui --help > nul && popd
 if %ERRORLEVEL% neq 0 goto :on_error
-pushd %NUNIF_DIR% && python -m waifu2x.gui --help > nul && popd
+pushd "%NUNIF_DIR%" && python -m waifu2x.gui --help > nul && popd
 if %ERRORLEVEL% neq 0 goto :on_error
 
 
@@ -80,7 +79,7 @@ exit /b 0
   set MINGIT_URL=https://github.com/git-for-windows/git/releases/download/v2.45.2.windows.1/MinGit-2.45.2-64-bit.zip
   set TMP_DIR=%ROOT_DIR%\tmp
 
-  if not exist %TMP_DIR% mkdir %TMP_DIR%
+  if not exist "%TMP_DIR%" mkdir "%TMP_DIR%"
 
   @rem Install MinGit
   powershell -NoProfile -ExecutionPolicy Bypass -Command ^
@@ -103,8 +102,7 @@ exit /b 0
   set GETPIP_URL=https://bootstrap.pypa.io/get-pip.py
   set PTH_PATH=%PYTHON_DIR%\python310._pth
   set TMP_DIR=%ROOT_DIR%\tmp
-
-  if not exist %TMP_DIR% mkdir %TMP_DIR%
+  if not exist "%TMP_DIR%" mkdir "%TMP_DIR%"
 
   @rem Install Embeddable Python
   powershell -NoProfile -ExecutionPolicy Bypass -Command ^
@@ -115,8 +113,8 @@ exit /b 0
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 
   @rem setup pth file to work isolated mode
-  echo ..\nunif>> %PTH_PATH%
-  echo import site>> %PTH_PATH%
+  echo ..\nunif>> "%PTH_PATH%"
+  echo import site>> "%PTH_PATH%"
 
   echo Successfully installed Python
 
@@ -127,7 +125,7 @@ exit /b 0
              "Start-BitsTransfer -Source $env:GETPIP_URL -Destination $env:PYTHON_DIR\get-pip.py"
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 
-  python %PYTHON_DIR%\get-pip.py
+  python "%PYTHON_DIR%\get-pip.py"
   if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
 
   echo Successfully installed pip
diff --git a/windows_package/waifu2x-gui.bat b/windows_package/waifu2x-gui.bat
index 601d68f6..267b723a 100644
--- a/windows_package/waifu2x-gui.bat
+++ b/windows_package/waifu2x-gui.bat
@@ -1,5 +1,5 @@
 @echo off
 
-call %~dp0setenv.bat
-pushd %NUNIF_DIR% && start "" pythonw -m waifu2x.gui && popd
+call "%~dp0setenv.bat"
+pushd "%NUNIF_DIR%" && start "" pythonw -m waifu2x.gui && popd
 exit /b 0
diff --git a/windows_package/waifu2x-web.bat b/windows_package/waifu2x-web.bat
index fcaefeb5..20184f5f 100644
--- a/windows_package/waifu2x-web.bat
+++ b/windows_package/waifu2x-web.bat
@@ -1,6 +1,6 @@
 @echo off
 
-call %~dp0setenv.bat
-cd %NUNIF_DIR%
+call "%~dp0setenv.bat"
+cd "%NUNIF_DIR%"
 python -m waifu2x.web
 pause