Have you completed the main quest to that point?
I tried to move my save data into the new version but whenever I start opening the 501 version, I get this tab saying that "your profile cannot be used because it is from a newer version of NW.js. Some features may be unavailable. Please specify a different profile directory or use a newer version of NW.js." It doesn't help that whenever I open the game, it runs at like three to five frames a second and is very slow.
Did I do something wrong when I got the save data transferred or is this a bug?