update setup script to create ~/Downloads dir, and delete existing
update setup script to create ~/Downloads dir, and delete existing

bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg