modify post_install.bat according to...

modify post_install.bat according to https://github.com/arduino/ArduinoCore-megaavr/blob/master/post_install.bat

post_install.bat

 @echo off
-set ARGS=/SE /SW /SA
+set ARGS=/LM /SW /SA
 if "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
   drivers\dpinst-amd64.exe %ARGS%
 ) ELSE IF "%PROCESSOR_ARCHITEW6432%" == "AMD64" (
@@ -8,21 +8,4 @@ if "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
   drivers\dpinst-x86.exe %ARGS%
 )
 
-@echo off
-setlocal
-for /f "tokens=4-5 delims=[.] " %%i in ('ver') do @(if %%i==Version (set VERSION=%%j) else (set VERSION=%%i))
-if %VERSION% GEQ 10 (
-  exit /b 0
-)
-endlocal
-
-REM dpinst /PATH has problems with relative paths, so use absolute path.
-if "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
-  drivers\dpinst-amd64.exe /PATH %cd%\drivers\prewin10 %ARGS%
-) ELSE IF "%PROCESSOR_ARCHITEW6432%" == "AMD64" (
-  drivers\dpinst-amd64.exe /PATH %cd%\drivers\prewin10 %ARGS%
-) ELSE (
-  drivers\dpinst-x86.exe /PATH %cd%\drivers\prewin10 %ARGS%
-)
-
 exit /b 0