Hey there! Fellow mac user here, so I might be able to help if it still hasn't worked. If you already downloaded to 1.5 ver, I suggest you move all dlcs from your last downloaded game of Cove and move it to the game folder in the 1.5. To get to the Game Folder, you'll need to click "Show Package Contents" by right clicking. One you've got show package contents it shouldn't take much to find the game folders (Contents -> Resources -> Autorun -> Game). It might ask later ask you about a privacy issue and that it wont work because of an unidentified creator or smth like that. Just go to setting, click on security and privacy, get on the General tab in it, and then allow the Cove game to work! Hopefully this helps. <3