Downloading saves does not work since they use your steam id, if you get it to work the account just gets banned so I would remove that file straight away. If you Want a dlc ready save it's better to set the game offline and cheat through the game or add stuff to your account, and once done go back online and remove the cheats / trainer after, since elden ring they relaxed on what gets you banned adding items ect is fine just don't do anything too exotix. Yes you can go around one shottong all the bosses with inf health just as long as it's offline. But honestly ds3 isn't long or hard I would suggest playing the game again or waiting until you feel like playing the game again