Hey guys! You can actually just download the new version of the game and start using it–your save file doesn't live with the game files, it's stored on your computer somewhere else.
It's probably a good idea to delete your old copy of the game when you make the switch, because it can screw with your savegame if you accidentally open a new savegame with an old version
also i dont know if this is something, but i played fullscreen for like an hour or so and the zooms in and out from plant to room gave me real bad motion sickness.
Edit: i think it could be partially fixed by having a Move Mode button or smthn. So you could click that and make everything moveable. It would make it a whole lot easier to organize plants and furniture without moving in and out constantly.
