(This is on a mac). I had done this previously but cannot seem to get it to work any more. I can download a map or scenario and when I choose it it opens in the editor, which seems fair enough. What I can't seem to do is save it as (open it as) a playable game. What have I forgotten?
I have previously observed that the choose dialogs are confusing in that I have to triple click the download folder in order to see downloaded files.