Add helpful error message for uncompressed downloads (#4205)
Add helpful error message for uncompressed downloads (#4205)


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