Still confused. When I had run Ripples on the new one, it looks like it created one in the Renpy folder there, but when I went back to the old computer, I didn't find a similar folder. Maybe I'm SOL.
Copy and paste this into your Windows Explorer window address bar on both computers after running the game once on the new system: %appdata%\RenPy
That will navigate straight to the save location for all Renpy games. You can copy folders straight across or just do the whole renpy folder if you'd like.