Fix

make_venv_portable.bat

@@ -0,0 +1,46 @@
+@echo off
+
+cd /d %~dp0
+
+REM breaks if special characters are in path
+:make_venv_portable
+set pyvenv="%~dp0.venv\pyvenv.cfg"
+set pyvenvtemp="%~dp0.venv\pyvenv.tmp"
+for /f "tokens=*" %%i in ('python -V') do set pyver=%%i
+for /f %%i in ('where python') do set pypath=%%i
+set v=home version executable command
+for %%a in (%v%) do for /f "tokens=*" %%i in ('findstr /b %%a %pyvenv%') do set %%a=%%i
+if exist %pyvenvtemp% del %pyvenvtemp%
+setlocal enabledelayedexpansion
+(
+    for /f "tokens=1* delims=:" %%a in ('findstr /n "^" %pyvenv%') do (
+        set "line=%%b"
+        if "!line!"=="%home%" (set line=home = %pypath:~0,-11%)
+        if "!line!"=="%version%" (set line=version = %pyver:~7%)
+        if "!line!"=="%executable%" (set line=executable = %pypath%)
+        if "!line!"=="%command%" (set line=command = %pypath% -m venv %~dp0.venv)
+        echo(!line!
+    )
+) > %pyvenvtemp%
+endlocal
+del %pyvenv%
+rename %pyvenvtemp% pyvenv.cfg
+
+set activate="%~dp0.venv\Scripts\activate.bat"
+set activatetemp="%~dp0.venv\Scripts\activate.tmp"
+for /f "tokens=*" %%i in ('findstr "VIRTUAL_ENV=" %activate%') do set virtual=%%i
+if exist %activatetemp% del %activatetemp%
+setlocal enabledelayedexpansion
+(
+    for /f "tokens=1* delims=:" %%a in ('findstr /n "^" %activate%') do (
+        set "line=%%b"
+        if "!line!"=="%virtual%" (set line=set "VIRTUAL_ENV=%~dp0.venv")
+        if "!line!"=="END" (set line=:END)
+        echo(!line!
+    )
+) > %activatetemp%
+endlocal
+del %activate%
+rename "%activatetemp%" activate.bat
+
+pause

start.bat

@@ -4,66 +4,28 @@ TITLE MB
 
 cd /d %~dp0
 
-REM goto :make_venv_portable
+py --version 3 >nul 2>&1
+if errorlevel 1 goto install
 
 if not exist .venv\Scripts\activate.bat (
-    python -m venv .venv
-)
-
-(
+    py -m venv .venv
     .venv\Scripts\activate.bat
-    python -m pip install -r requirements.txt
-    python pyeamu.py
+    py -m pip install -r requirements.txt
+    py pyeamu.py
+) else (
+    .venv\Scripts\activate.bat
+    py pyeamu.py
 )
 
-echo:
-echo Install python with "Add python.exe to PATH" checked
+goto :EOF
+
+:install
 echo https://www.python.org/downloads/
+echo Install Python with "Add python.exe to PATH" checked
 echo:
-echo Note: Choose the previous version if latest is 3.xx.0
+echo Install the previous version if latest is 3.xx.0
+echo - libraries may be broken on 3.xx.0
+echo - don't install pre-release version
 echo:
 
 pause
-
-goto :eof
-
-REM breaks when special characters are in path
-:make_venv_portable
-set pyvenv="%~dp0.venv\pyvenv.cfg"
-set pyvenvtemp="%~dp0.venv\pyvenv.tmp"
-for /f "tokens=*" %%i in ('python -V') do set pyver=%%i
-for /f %%i in ('where python') do set pypath=%%i
-set v=home version executable command
-for %%a in (%v%) do for /f "tokens=*" %%i in ('findstr /b %%a %pyvenv%') do set %%a=%%i
-if exist %pyvenvtemp% del %pyvenvtemp%
-setlocal enabledelayedexpansion
-(
-    for /f "tokens=1* delims=:" %%a in ('findstr /n "^" %pyvenv%') do (
-        set "line=%%b"
-        if "!line!"=="%home%" (set line=home = %pypath:~0,-11%)
-        if "!line!"=="%version%" (set line=version = %pyver:~7%)
-        if "!line!"=="%executable%" (set line=executable = %pypath%)
-        if "!line!"=="%command%" (set line=command = %pypath% -m venv %~dp0.venv)
-        echo(!line!
-    )
-) > %pyvenvtemp%
-endlocal
-del %pyvenv%
-rename %pyvenvtemp% pyvenv.cfg
-
-set activate="%~dp0.venv\Scripts\activate.bat"
-set activatetemp="%~dp0.venv\Scripts\activate.tmp"
-for /f "tokens=*" %%i in ('findstr "VIRTUAL_ENV=" %activate%') do set virtual=%%i
-if exist %activatetemp% del %activatetemp%
-setlocal enabledelayedexpansion
-(
-    for /f "tokens=1* delims=:" %%a in ('findstr /n "^" %activate%') do (
-        set "line=%%b"
-        if "!line!"=="%virtual%" (set line=set VIRTUAL_ENV=%~dp0.venv)
-        if "!line!"=="END" (set line=:END)
-        echo(!line!
-    )
-) > %activatetemp%
-endlocal
-del %activate%
-rename "%activatetemp%" activate.bat