first time to create .bat ...

You are incorrect in concept.

when you type ftp on command line, it has started the ftp program, so the next line you type is command to ftp program instead of to the command prompt.

When you execute a batch file, and entered ftp, the next line is another line execute under command line instead of enter into the ftp program, so after you exit the ftp program, it will execute the next line, but of course you will get another error.

to overcome, you may try the following, but it cannot resolve all problems

ipconfig /all

get 100MBvideo.zip | ftp -A download.speedtest.com.hk

@echo off

rem FileSize= 10Mb or 100MB

set FileSize=10MB

if "%1"=="10MB" set FileSize=10MB

if "%1"=="100MB" set FileSize=100MB

set downloadcmdFile=downloadcmd.txt

set uploadcmdFile=uploadcmd.txt

set VideoFile=%FileSize%video.zip

set DownloadHost=download.speedtest.com.hk

set UploadHost=upload.speedtest.com.hk

if "%OS%"=="Windows_NT" goto SystemOK

Echo Warning: This script has been tested on Windows XP only.

echo Press Ctrl+C to end or

pause

:SystemOK

echo Start

rem Use 'ftp' as username and password

echo ftp> %downloadcmdFile%

echo ftp>> %downloadcmdFile%

echo get %VideoFile%>> %downloadcmdFile%

echo bye>> %downloadcmdFile%

rem Use 'ftp' as username and password

echo ftp> %uploadcmdFile%

echo ftp>> %uploadcmdFile%

echo put %VideoFile%>> %uploadcmdFile%

echo bye>> %uploadcmdFile%

cls

title SpeedTest (Ctrl-c to cancel)

echo This script will perform both download and upload tests by downloading and uploading a %FileSize% file with speedtest.com.hk.

echo.

echo Press Ctrl+C to end or

pause

echo ------------------------------------------------------------------

echo Performing Download test ......

ftp -s:%downloadcmdFile% %DownloadHost%

echo ------------------------------------------------------------------

echo Performing Upload test ......

ftp -s:%uploadcmdFile% %UploadHost%

del /q %VideoFile%

del /q %downloadcmdFile%

del /q %uploadcmdFile%

:End

pause