fixed install steps for version 4
fixed install steps for version 4

LLNL/spack,lgarren/spack,krafczyk/spack,skosukhin/spack,mfherbst/spack,tmerrick1/spack,skosukhin/spack,EmreAtes/spack,EmreAtes/spack,matthiasdiener/spack,iulian787/spack,krafczyk/spack,matthiasdiener/spack,LLNL/spack,matthiasdiener/spack,iulian787/spack,TheTimmy/spack,krafczyk/spack,skosukhin/spack,LLNL/spack,iulian787/spack,tmerrick1/spack,matthiasdiener/spack,tmerrick1/spack,mfherbst/spack,TheTimmy/spack,LLNL/spack,mfherbst/spack,mfherbst/spack,TheTimmy/spack,krafczyk/spack,lgarren/spack,LLNL/spack,iulian787/spack,EmreAtes/spack,iulian787/spack,tmerrick1/spack,skosukhin/spack,TheTimmy/spack,lgarren/spack,TheTimmy/spack,EmreAtes/spack,krafczyk/spack,tmerrick1/spack,lgarren/spack,mfherbst/spack,EmreAtes/spack,skosukhin/spack,matthiasdiener/spack,lgarren/spack