Install all VSIX in current directory using windows batch file.

setup.bat

@echo off

set app="C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service\VSIXInstaller.exe"

for /r %%f in (*.vsix) do (
	call :setup "%%f"
)
goto end

:setup
echo.
call :print install package %1

%app% %1 /q

if %errorlevel% neq 0 (
	call :print setup failed!
) else (
	call :print setup done!
)
goto:eof

:end
call :print setup finished!
pause

:print
echo [%date% %time%]: %*
echo [%date% %time%]: %*>>output_log.txt
goto:eof