Really though... we should all be starting fresh games with the new update to keep on finding bugs or things that can be improved. The old games are just old games. I implore everyone to just start fresh with every new release. By all means... keep the older ones and see if there are any bugs that are created or carried over to a new version from an old but definitely start fresh.
The games pretty fun as is and there's nothing like having nothing and finding that axe or saw in an unexpected place. Found a gas can in a bin in one game... promptly died... but I've been checking them ever since