again, currently 7ds only runs with 1.05
i have both 1.1 and 1.05. to do that, upgrade your game to 1.1, then copy your ENTIRE stardock/ironclad program file, and save it as a backup or zip. then, uninstall the game and reinstall. update to 1.05, again back it up. now you should have three files. all i have to do is swap one for another and i can switch versions within a minute.
Most of us at 7DS use hamachi for convenience, but i do believe that people have played 7ds on ICO.