The Save function can be accessed via the menu which can be accessed using the "Esc" button (at least for me). It will be the second bottom option just above "End Game" (will need to scroll down to see option).
When switching between updates, the saves are not automatically transferred so you will need to do so manually. To do so manually, in the game's folder there should be a "www" folder. Inside this folder should be a "saves" folder. Transfer the "saves" folder from the old version into the "www" folder of the new version.
This is based on a Windows computer, if you don't use a Windows computer you might need to do different things.