CHANGE .KETTLE PATH to directory itself

 open "spoon.bat"

--just down to kettle_home commented add

set KETTLE_HOME=.

:: **************************************************
:: ** Kettle home                                  **
:: **************************************************

if "%KETTLE_DIR%"=="" set KETTLE_DIR=%~dp0
if %KETTLE_DIR:~-1%==\ set KETTLE_DIR=%KETTLE_DIR:~0,-1%

cd %KETTLE_DIR%
set KETTLE_HOME=.
set PENTAHO_JAVA=javaw
set IS64BITJAVA=0

call "%~dp0set-pentaho-env.bat"

(Highlighted in green color)