added conditional and flag to state the target is in progress of processing whether user can download or not. prevents multiple downloads from being triggered while it's in progress
added conditional and flag to state the target is in progress of processing whether user can download or not. prevents multiple downloads from being triggered while it's in progress

informatics-isi-edu/chaise,informatics-isi-edu/chaise,informatics-isi-edu/chaise,informatics-isi-edu/chaise