Add missing / Avoids potential problem of it not seeing an existing cache, depending on the CWD on the cache drive at the point the target is running (which could be anything really).

@echo off
setlocal
if not defined HELIUM_HOME set HELIUM_HOME=%~dp0..\..\..\..\helium
echo %HELIUM_HOME%
rem call ..\..\build\env.bat
call %HELIUM_HOME%\hlm.bat %*
endlocal