diff --git a/batch/update.bat b/batch/update.bat
index 2a7fc7b2..a492fbc4 100644
--- a/batch/update.bat
+++ b/batch/update.bat
@@ -1,11 +1,16 @@
 @if not "%~0"=="%~dp0.\%~nx0" start /min cmd /c,"%~dp0.\%~nx0" %* & goto :eof
 
-taskkill /im %1 /F
+set exe_name=%1
+set folder_name=%2
+set tmp_name=%3
+set restart=%4
+
+taskkill /im %exe_name% /F
 ping -n 2 127.0.0.1 > nul
-del /f %1
-ping -n 2 127.0.0.1 > nul
-rename %2 %1
-ping -n 2 127.0.0.1 > nul
-if %3 == True (
-    START "" %1
+del /f %exe_name%
+rmdir /s %folder_name%
+move %tmp_name%\* .\
+del /f %tmp_name%
+if %restart% == True (
+    START "" %exe_name%
 )
\ No newline at end of file
diff --git a/installer/Install.nsi b/installer/Install.nsi
index 5ee5b8bc..45235ed8 100644
--- a/installer/Install.nsi
+++ b/installer/Install.nsi
@@ -139,7 +139,7 @@ Section
     ; 出力先を指定します。
     SetOutPath "$INSTDIR\docs"
     ; インストールされるファイル
-    File "..\dist\README.txt"
+    File "..\README.txt"
   ${EndIf}
 
   ; アンインストーラを出力
diff --git a/model.py b/model.py
index af1d3777..ecf57fc3 100644
--- a/model.py
+++ b/model.py
@@ -268,7 +268,7 @@ class Model:
     def updateSoftware(restart:bool=True):
         filename = 'VRCT.zip'
         program_name = 'VRCT.exe'
-        temporary_name = '_VRCT.exe'
+        folder_name = '_internal'
         tmp_directory_name = 'tmp'
         batch_name = 'update.bat'
         current_directory = os_path.dirname(sys.argv[0])
@@ -285,9 +285,7 @@ class Model:
                     file.write(chunk)
             with ZipFile(os_path.join(current_directory, tmp_directory_name, filename)) as zf:
                 zf.extract(program_name, os_path.join(current_directory, tmp_directory_name))
-            os_rename(os_path.join(current_directory, tmp_directory_name, program_name), os_path.join(current_directory, temporary_name))
-            rmtree(os_path.join(current_directory, tmp_directory_name))
-            command = [os_path.join(program_directory, "batch", batch_name), program_name, temporary_name, str(restart)]
+            command = [os_path.join(program_directory, "batch", batch_name), program_name, folder_name, tmp_directory_name, str(restart)]
             Popen(command)
         except:
             webbrowser.open(config.BOOTH_URL, new=2, autoraise=True)