Browse to bin folder:
License server: C:\Program Files\PTC\FLEXnet Admin License Server\bin
Creo parametric: C:\Program Files\PTC\Creo 2.0\parametric\bin
pushd <path>
for %I in (.) do set bin_dir=%~sI

set lic_path=%path%;%bin_dir%
setx path "%lic_path%" /m

Close the command prompt and open a new one.