Hi Summer, welcome!
That is a feature that has been mentioned before. Unfortunately, there is no way to do what you mentioned right now.
We do intend to address this issue in the near future though, and ideas include having check boxes on each Download for you to select to download, to even a one-click 'automatic update' of all new Downloads. Implementation will not be easy though (esp the latter idea), so it may not be that soon that we will get this, but I'm sure we'll get there one day! In any event, you can be sure it's on our to-do list!
KL