Use the Downloads folder as shared folder between two Macs with Dropbox
I would probably be simpler in the long run - if a little tedious depending on how many apps might use that Downloads folder - to set your Dropbox folder to be your download destination, rather than trying to persuade Dropbox to use another folder.

For Safari, set it in Prefs > General. Click download location, select other &amp; navigate to your Dropbox folder.



You would have to do the same for any other apps that would use your standard downloads folder - but I'm certain it would be easier than trying to persuade Dropbox to use your original Downloads folder as its shared location.

I'm sure the alternative would be to make a symlink from Dropbox to Downloads, but I'm just not convinced it would be simpler to maintain.